OVERALL

SPECS

VS AVERAGE

REVIEWS

ALTERNATIVES

Canon EF 300mm F 4L IS USM Review | 54 Data compared

Avg. price in UK: ~£1,040
Avg. price in US: ~$1,250
Lens mount: Canon EF
Maximum focal length: 300 mm
Maximum aperture (telephoto end): 4
Optical image stabilization: yes
Maximum angle of view: 8.3 °

Canon EF 300mm F 4L IS USM review. Compare 54 technical specifications and user reviews to see how it ranks among camera lenses and if it is worth buying.

7.6

Very good

7.5

Very good

8.2

Excellent

9.8
Low-light photography
Score components:
70.0%
9.7
Maximum aperture (telephoto end)
30.0%
10
Optical image stabilization
8.1
Travel
Score components:
30.0%
6.4
Lens length
25.0%
6.7
Lens diameter
25.0%
10
Weather sealing (splashproof)
20.0%
10
Optical image stabilization

Best prices in UK

Best rankings

Verdict

The Canon EF 300mm f/4L IS USM is a professional-grade L-series prime lens featuring a fast f/4 maximum aperture and a sophisticated optical design with 15 elements in 11 groups, including two Ultra-low Dispersion (UD) elements to minimize chromatic aberrations. Its main characteristics include a 2-stop Image Stabilizer (IS) with dual modes for stationary and panning shots, a quiet and rapid ring-type Ultrasonic Motor (USM) for autofocus, and a close minimum focusing distance of 1.5m (4.9 ft). Pros include exceptional sharpness even when wide open, a durable metal build with a built-in retractable lens hood, and a relatively lightweight 1,190g frame that is highly portable for sports and wildlife photography. However, some cons include an aging first-generation stabilization system compared to modern 4-stop equivalents, the lack of a rubber weather-sealing gasket at the mount, and potential purple fringing on high-resolution crop sensors.

Technical Specifications of Canon EF 300mm F 4L IS USM

Overall score

7.6

Show more

Hide

Popularity

What it is: An indicator based on the number of reviews received by the camera lens.

When it matters: When you want to see which camera lenses attract the most buyer attention and review activity.

Mount & Format

8.2

Show more

Hide

Lens type

What it is: The optical category that indicates whether the lens is a prime, zoom, macro, fisheye, or another design.

When it matters: When you are choosing between a prime, zoom, macro, or specialty lens for the kind of subjects you shoot.

Importance: LOW

telephoto prime

Lens mount

What it is: The mechanical and electronic interface that determines which cameras the lens can be attached to.

When it matters: When camera compatibility and access to the right lens ecosystem are central to your buying decision.

Importance: LOW

Canon EF

Sensor format coverage

What it is: The largest sensor size the lens is designed to cover without severe vignetting.

When it matters: When you need the lens to fully cover your camera sensor without heavy corner darkening.

Importance: LOW

Full-frame

Filter thread size

What it is: The diameter of the front filter thread used for screw-in filters and compatible accessories.

When it matters: When you plan to use screw-in filters such as polarizers, ND filters, or protective glass.

Importance: LOW

77 mm

Teleconverter compatibility

What it is: Whether the lens can be used with compatible teleconverters to extend focal length.

When it matters: When you want to extend reach for wildlife or sports without changing to a different long lens.

Importance: HIGH

Show more

Optics & Aperture

8.0

Show more

Hide

Minimum focal length

What it is: The shortest focal length the lens can provide, which determines its widest framing.

When it matters: When wide framing matters for landscapes, interiors, architecture, or travel shots.

Importance: LOW

300 mm

Maximum focal length

What it is: The longest focal length the lens can reach, which determines its telephoto reach.

When it matters: When you need more reach for wildlife, sports, stage events, or distant details.

Importance: LOW

300 mm

Optical zoom

What it is: The ratio between the longest and shortest focal lengths available in the lens zoom range.

When it matters: When you want one lens to cover a broader range of compositions without swapping glass.

Importance: LOW

?

Maximum angle of view

What it is: The widest scene the lens can capture at its shortest focal length.

When it matters: When you need to fit more of a room, skyline, or landscape into the frame.

Importance: LOW

8.3 °

Minimum angle of view

What it is: The narrowest scene the lens captures at its longest focal length.

When it matters: When you want tighter framing on faraway subjects without moving closer.

Importance: LOW

8.2 °

Show more

Focus & Controls

6.5

Show more

Hide

Focus motor

What it is: The autofocus drive system responsible for moving lens elements into focus.

When it matters: When fast, quiet autofocus matters for video, wildlife, street shots, or moving subjects.

Importance: LOW

ring USM

Minimum focus distance

What it is: The shortest distance at which the lens can focus on a subject.

When it matters: When you like shooting details, food, flowers, or products from a very short distance.

Importance: MEDIUM

Maximum reproduction ratio

What it is: The highest magnification the lens can achieve when focusing at its closest distance.

When it matters: When close-up magnification matters for macro work, textures, or small product details.

Importance: MEDIUM

Full-time manual focus

What it is: The ability to adjust focus manually without leaving autofocus mode.

When it matters: When you want to fine-tune focus instantly without switching out of autofocus.

Importance: HIGH

Internal focusing

What it is: A focusing design in which internal elements move while the outer barrel length stays unchanged.

When it matters: When you use polarizers, gimbals, or close-up setups that benefit from a lens that does not extend while focusing.

Importance: HIGH

Show more

Stabilization

6.7

Show more

Hide

Optical image stabilization

What it is: A hardware system that shifts optical elements to counteract camera shake and reduce blur.

When it matters: When you want steadier handheld shots and less blur, especially in low light or at longer focal lengths.

Importance: HIGH

Stabilization effectiveness (CIPA stops)

What it is: The rated stabilizer benefit, measured in stops, under CIPA testing standards.

When it matters: When you are comparing stabilized lenses and want to know how much handheld shutter-speed advantage they offer.

Importance: HIGH

Build & Handling

7.7

Show more

Hide

Weight

What it is: The total mass of the lens, affecting portability and handling balance on the camera body.

When it matters: When you carry a lens all day for travel, hiking, or event coverage and want to keep your kit manageable.

Importance: HIGH

?

Lens length

What it is: The physical length of the lens body from mount to front edge.

When it matters: When bag space, balance, or front clearance matters in a compact travel or video setup.

Importance: HIGH

Lens diameter

What it is: The widest outer diameter of the lens barrel.

When it matters: When grip comfort, filter size, or fit inside a tight camera bag matters to you.

Importance: MEDIUM

Weather sealing (splashproof)

What it is: Protective sealing intended to resist splashes, dust, and light environmental exposure.

When it matters: When you often shoot outdoors in light rain, dust, or changing conditions.

Importance: HIGH

Metal mount

What it is: A lens mount made of metal rather than plastic for greater durability at the camera connection point.

When it matters: When durability matters because you change lenses often or use heavier gear for work.

Importance: HIGH

Show more

Lab Scores

7.5

Show more

Hide

DxOMark overall score

What it is: The combined DxOMark lens rating based on lab-tested optical performance.

When it matters: When you want a quick lab-based summary of overall optical performance before comparing lenses in detail.

Importance: HIGH

?

DxOMark sharpness score

What it is: The DxOMark subscore that reflects how much detail the lens can resolve across the frame.

When it matters: When fine detail matters for landscapes, product work, or high-resolution cameras.

Importance: HIGH

DxOMark transmission

What it is: The measured light transmission of the lens, expressed as T-stop rather than nominal f-number.

When it matters: When real light loss matters for exposure consistency in studio, cinema, or mixed-lens shoots.

Importance: MEDIUM

DxOMark distortion

What it is: The DxOMark metric that measures how much the lens bends straight lines away from their true shape.

When it matters: When straight lines matter in architecture, interiors, copy work, or product photography.

Importance: MEDIUM

?

DxOMark vignetting

What it is: The DxOMark measurement of corner darkening relative to the center of the image.

When it matters: When even corner brightness matters for skies, studio backdrops, or clean product shots.

Importance: MEDIUM

Show more

Canon EF 300mm F 4L IS USM vs the average camera lens

Why is Canon EF 300mm F 4L IS USM better than the average camera lens?

Show more

Hide

Has optical image stabilization
Canon EF 300mm F 4L IS USM has optical image stabilization, the average camera lens does not. 29% of camera lenses include optical image stabilization.
What it is: A hardware system that shifts optical elements to counteract camera shake and reduce blur.
When it matters: When you want steadier handheld shots and less blur, especially in low light or at longer focal lengths.
Importance: HIGH
Canon EF 300mm F 4L IS USM has optical image stabilization, the average camera lens does not. 29% of camera lenses include optical image stabilization.
Teleconverter compatible
Canon EF 300mm F 4L IS USM supports teleconverters, while the average camera lens does not.
Supports EF 1.4x and EF 2x extenders.
What it is: Whether the lens can be used with compatible teleconverters to extend focal length.
When it matters: When you want to extend reach for wildlife or sports without changing to a different long lens.
Importance: HIGH
Canon EF 300mm F 4L IS USM supports teleconverters, while the average camera lens does not.
Has focus distance scale
Canon EF 300mm F 4L IS USM has a focus distance scale, the average camera lens does not. 48.6% of camera lenses include a focus distance scale.
What it is: A marked scale that shows the approximate focus distance set on the lens.
When it matters: When you pre-focus manually for street, zone focusing, or repeatable tripod setups.
Importance: MEDIUM
Canon EF 300mm F 4L IS USM has a focus distance scale, the average camera lens does not. 48.6% of camera lenses include a focus distance scale.
Has focus limiter switch
Canon EF 300mm F 4L IS USM has a focus limiter switch, the average camera lens does not. 16.4% of camera lenses include a focus limiter switch.
Distance-range limiter positions.
What it is: A control that restricts the focus range to improve autofocus speed and reduce hunting.
When it matters: When autofocus speed matters and you want to stop the lens from hunting through its full focus range.
Importance: LOW
Canon EF 300mm F 4L IS USM has a focus limiter switch, the average camera lens does not. 16.4% of camera lenses include a focus limiter switch.
0.4 EV less vignetting
Canon EF 300mm F 4L IS USM has less vignetting than the average camera lens (0.8 EV vs 1.2 EV). The average lens has vignetting of 1.2 EV.
What it is: The DxOMark measurement of corner darkening relative to the center of the image.
When it matters: When even corner brightness matters for skies, studio backdrops, or clean product shots.
Importance: MEDIUM
Canon EF 300mm F 4L IS USM has less vignetting than the average camera lens (0.8 EV vs 1.2 EV). The average lens has vignetting of 1.2 EV.0.8 EV vs 1.2 EV
2 points higher DxOMark sharpness
Canon EF 300mm F 4L IS USM has a higher DxOMark sharpness score than the average camera lens (18 vs 16). The average lens has a DxOMark sharpness score of 16.
What it is: The DxOMark subscore that reflects how much detail the lens can resolve across the frame.
When it matters: When fine detail matters for landscapes, product work, or high-resolution cameras.
Importance: HIGH
Canon EF 300mm F 4L IS USM has a higher DxOMark sharpness score than the average camera lens (18 vs 16). The average lens has a DxOMark sharpness score of 16.18 vs 16
Teleconverter compatible
Canon EF 300mm F 4L IS USM supports teleconverters, while the average camera lens does not.
Has focus distance scale
Canon EF 300mm F 4L IS USM has a focus distance scale, the average camera lens does not. 48.6% of camera lenses include a focus distance scale.
Has focus limiter switch
Canon EF 300mm F 4L IS USM has a focus limiter switch, the average camera lens does not. 16.4% of camera lenses include a focus limiter switch.
Has optical image stabilization
Canon EF 300mm F 4L IS USM has optical image stabilization, the average camera lens does not. 29% of camera lenses include optical image stabilization.
0.4 EV less vignetting
Canon EF 300mm F 4L IS USM has less vignetting than the average camera lens (0.8 EV vs 1.2 EV). The average lens has vignetting of 1.2 EV.
2 points higher DxOMark sharpness
Canon EF 300mm F 4L IS USM has a higher DxOMark sharpness score than the average camera lens (18 vs 16). The average lens has a DxOMark sharpness score of 16.

Focus & Controls

Why is Canon EF 300mm F 4L IS USM worse than the average camera lens?

Show more

Hide

1.2 higher f-number at telephoto end
Canon EF 300mm F 4L IS USM has a dimmer maximum telephoto aperture than the average camera lens (f/4 vs f/2.8). The average lens has a maximum telephoto aperture of f/2.8.
1 fewer aperture blades
Canon EF 300mm F 4L IS USM has fewer aperture blades than the average camera lens (8 vs 9). The average lens has 9 aperture blades.
2 fewer aspherical elements
Canon EF 300mm F 4L IS USM has fewer aspherical elements than the average camera lens (0 vs 2). The average lens has 2 aspherical elements.
1.2 m longer minimum focus distance
Canon EF 300mm F 4L IS USM has a higher minimum focus distance than the average camera lens (1.5 m vs 0.3 m). The average lens has a minimum focus distance of 0.3 m.
2 stops weaker stabilization
Canon EF 300mm F 4L IS USM has a lower stabilization effectiveness than the average camera lens (2 stops vs 4 stops). The average lens has stabilization effectiveness of 4 stops.
129 mm longer lens
Canon EF 300mm F 4L IS USM is longer than the average camera lens (221 mm vs 92 mm). The average lens has a length of 92 mm.
Fixed lens hood
Canon EF 300mm F 4L IS USM does not include a reversible lens hood, the average camera lens does. 79.6% of camera lenses include a reversible lens hood.
Older release date
Canon EF 300mm F 4L IS USM was released earlier than the average camera lens.
March 1997
13 mm wider lens barrel
Canon EF 300mm F 4L IS USM is wider than the average camera lens (90 mm vs 77 mm). The average lens has a diameter of 77 mm.
1.5 T-stop higher transmission value
Canon EF 300mm F 4L IS USM has a higher T-stop value than the average camera lens (4.6 T-stop vs 3.1 T-stop). The average lens has a T-stop value of 3.1 T-stop.
1.2 higher f-number at telephoto end
Canon EF 300mm F 4L IS USM has a dimmer maximum telephoto aperture than the average camera lens (f/4 vs f/2.8). The average lens has a maximum telephoto aperture of f/2.8.
What it is: The widest aperture available at the long end of the zoom range, affecting light intake and background blur.
When it matters: When you shoot at the long end in low light or want stronger background blur for portraits and sports.
Importance: HIGH
Canon EF 300mm F 4L IS USM has a dimmer maximum telephoto aperture than the average camera lens (f/4 vs f/2.8). The average lens has a maximum telephoto aperture of f/2.8.4 vs 2.8
129 mm longer lens
Canon EF 300mm F 4L IS USM is longer than the average camera lens (221 mm vs 92 mm). The average lens has a length of 92 mm.
What it is: The physical length of the lens body from mount to front edge.
When it matters: When bag space, balance, or front clearance matters in a compact travel or video setup.
Importance: HIGH
Canon EF 300mm F 4L IS USM is longer than the average camera lens (221 mm vs 92 mm). The average lens has a length of 92 mm.221 mm vs 92 mm
1.2 m longer minimum focus distance
Canon EF 300mm F 4L IS USM has a higher minimum focus distance than the average camera lens (1.5 m vs 0.3 m). The average lens has a minimum focus distance of 0.3 m.
What it is: The shortest distance at which the lens can focus on a subject.
When it matters: When you like shooting details, food, flowers, or products from a very short distance.
Importance: MEDIUM
Canon EF 300mm F 4L IS USM has a higher minimum focus distance than the average camera lens (1.5 m vs 0.3 m). The average lens has a minimum focus distance of 0.3 m.1.5 m vs 0.3 m
Fixed lens hood
Canon EF 300mm F 4L IS USM does not include a reversible lens hood, the average camera lens does. 79.6% of camera lenses include a reversible lens hood.
What it is: A hood design that can be mounted backward on the lens for more compact storage.
When it matters: When compact packing matters and you want the hood stored neatly on the lens.
Importance: LOW
Canon EF 300mm F 4L IS USM does not include a reversible lens hood, the average camera lens does. 79.6% of camera lenses include a reversible lens hood.
2 stops weaker stabilization
Canon EF 300mm F 4L IS USM has a lower stabilization effectiveness than the average camera lens (2 stops vs 4 stops). The average lens has stabilization effectiveness of 4 stops.
What it is: The rated stabilizer benefit, measured in stops, under CIPA testing standards.
When it matters: When you are comparing stabilized lenses and want to know how much handheld shutter-speed advantage they offer.
Importance: HIGH
Canon EF 300mm F 4L IS USM has a lower stabilization effectiveness than the average camera lens (2 stops vs 4 stops). The average lens has stabilization effectiveness of 4 stops.2 stops vs 4 stops
1 fewer aperture blades
Canon EF 300mm F 4L IS USM has fewer aperture blades than the average camera lens (8 vs 9). The average lens has 9 aperture blades.
What it is: The number of diaphragm blades that shape the aperture opening and influence blur rendering.
When it matters: When the look of out-of-focus highlights matters in portraits, close-ups, or cinematic video.
Importance: HIGH
Canon EF 300mm F 4L IS USM has fewer aperture blades than the average camera lens (8 vs 9). The average lens has 9 aperture blades.8 vs 9
Older release date
Canon EF 300mm F 4L IS USM was released earlier than the average camera lens.
March 1997
What it is: The date when the lens model was first officially introduced.
When it matters: When you prefer a newer optical design with more modern autofocus, coatings, or stabilization features.
Importance: LOW
Canon EF 300mm F 4L IS USM was released earlier than the average camera lens.1997 vs 2016
13 mm wider lens barrel
Canon EF 300mm F 4L IS USM is wider than the average camera lens (90 mm vs 77 mm). The average lens has a diameter of 77 mm.
What it is: The widest outer diameter of the lens barrel.
When it matters: When grip comfort, filter size, or fit inside a tight camera bag matters to you.
Importance: MEDIUM
Canon EF 300mm F 4L IS USM is wider than the average camera lens (90 mm vs 77 mm). The average lens has a diameter of 77 mm.90 mm vs 77 mm

Optics & Aperture

Focus & Controls

Build & Handling

Graphic comparison of Canon EF 300mm F 4L IS USM and

Attribute category

Attribute

No results found

Third-party reviews

United Kingdom

United States

(Reviews last updated: July 2026)

What customers like about Canon EF 300mm F 4L IS USM?

Excellent optical sharpness, even when shooting wide open at f/4
Sturdy, high-quality professional L-series metal construction
Relatively lightweight and compact for a 300mm telephoto prime lens
Smooth and pleasing background blur (bokeh)
Convenient built-in retractable lens hood
Works exceptionally well when paired with a 1.4x teleconverter
Affordable entry price compared to faster f/2.8 alternatives

What customers dislike about Canon EF 300mm F 4L IS USM?

Image stabilization performance is basic and shows its age compared to modern lenses
Autofocus motor can feel slow or loud under demanding conditions
Noticeable purple fringing and chromatic aberration, especially on crop (APS-C) sensors
Visible softening in overall image resolution when adapted to modern high-megapixel bodies
The white exterior paint job easily draws unwanted attention in public settings

Expert reviews

the-digital-picture.com

22/07/2004

Summary of the review

Canon EF 300mm f/4L IS USM Lens Review

The Canon EF 300mm f/4L IS USM is a highly regarded, sharp telephoto prime lens featuring robust L-series build quality, excellent color/contrast, and minimal chromatic aberration. Key pros include exceptional sharpness at f/4.0, fast Ring USM autofocus suitable for sports, a short 4.9-foot minimum focus distance, and a convenient built-in lens hood. Conversely, the review notes specific cons, including very slight pincushion distortion and minor full-frame corner vignetting at f/4.0, both of which disappear when stopped down. Other drawbacks include a "clunking" sound from the autofocus mechanism, only partial weather sealing without a rubber mount gasket, and an older-generation image stabilizer that offers roughly 2 stops of correction.

ephotozine.com

23/02/2006

Summary of the review

Canon EF 300mm f/4 L IS USM Interchangeable Lens Review

The Canon EF 300mm f/4 L IS USM is a compact, robustly built, and affordably priced telephoto lens offering exceptional contrast, color rendition, and a practical retractable lens hood. It is well-regarded by professionals for its solid construction and performance, despite being an older design. However, the lens suffers from sluggish autofocus, especially when paired with a 1.4x teleconverter, and its optical resolution may not fully satisfy the demands of modern, high-megapixel sensors.

lenstip.com

13/11/2009

Summary of the review

Canon EF 300 mm f/4L IS USM review - Introduction

The LensTip review of the Canon EF 300 mm f/4L IS USM evaluates this classic telephoto prime lens, highlighting its high build quality and excellent value proposition. The lens achieves outstanding image resolution in the frame center and very good sharpness at the borders. Optically, it excels by maintaining very low chromatic aberration, negligible distortion, invisible coma, and almost completely absent vignetting. Mechanically, its professional L-series construction features a solid, sealed barrel, a built-in retractable lens hood, and a fast, quiet, and accurate USM autofocus system. However, the review notes that the lens's overall performance shows its age, particularly concerning its old optical coatings and legacy mechanics. The primary cons are its average performance when shooting against bright light and an outdated first-generation optical stabilization system that is only efficient at a level of 2 EV. While newer market alternatives deliver 3 to 4 stops of stabilization, LensTip concludes that the lens remains a highly successful and well-rounded tool when weighing its vast list of optical pros against these minor, age-related cons. LensTip.com

digital-photography-school.com

11/06/2014

Summary of the review

Lens Review Canon 300mm f4 lens for Sports Photography

📸 Canon 300mm f/4L IS review 👍 Pros: Small, light, handholdable. 👍 Solid metal L-series body. 👍 Fast, snappy USM autofocus. 👍 Built-in sliding lens hood. 👍 Beautiful background bokeh. 👎 Cons: 300mm fixed focal length. 👎 Might be too long on crop sensors. 👎 IS is unneeded for fast action. ⚾ Perfect for youth baseball ⚡ Great pairing with 5D Mark III. 🏃 Easily tracks moving players. 💼 Fits standard long compartments. 🤔 Want to know about its sharpness?

wlcastleman.com

No explicit date

Summary of the review

Canon EF 300mm f/4 L IS USM Lens Review

The Canon EF 300mm f/4 L IS USM is a sharp, compact, and lightweight telephoto lens that offers strong value for its price, particularly when traveling or shooting hand-held without a tripod. Its primary advantages include excellent image sharpness even when shot wide open at f/4, great contrast and color fidelity, and highly effective image stabilization that allows for crisp hand-held shots at significantly slower shutter speeds than the traditional 1/focal length rule. Additionally, it functions as a reasonably capable 420mm lens when paired with an EF 1.4x extender, and it is substantially cheaper and lighter than its f/2.8 counterpart. However, the lens does have notable limitations, most prominently a loss in optical resolution and microcontrast when compared to the older, non-image-stabilized version of the same lens. The maximum f/4 aperture restricts its performance in low-light environments and yields background blurring (bokeh) that is inferior to the f/2.8 version. Furthermore, autofocus speeds depend heavily on the camera body used, and attaching the 1.4x extender slows down autofocus performance considerably while narrowing the optimal sharpness window to between f/8 and f/11.

photo-outdoor.de

01/06/2015

Summary of the review

Praxistest Canon EF 300mm f/4 L IS - photo-outdoor.de

The Canon EF 300mm f/4 L IS is a highly durable, weather-sealed L-series prime lens featuring a robust metal barrel and an integrated, retractable lens hood that simplifies field use. Optically, the lens delivers impressive sharpness and contrast even wide open at f/4, turning in excellent results for capturing intricate details like bird plumage. Its fast, quiet USM autofocus handles action effectively, and the lens shows great versatility by working well with teleconverters—even retaining autofocus on a 5D Mark IV when paired with a 2x extender. Additionally, while not a dedicated macro lens, its 1.5-meter minimum focusing distance can be paired with an extension ring to produce macro shots with a beautiful, soft bokeh. Despite its great performance, the lens has a few drawbacks rooted in its older design. Its integrated image stabilizer is a first-generation system that only offers a two-stop exposure advantage and lacks automatic tripod detection, meaning photographers must manually switch it off when the lens is mounted. When shooting wide open, slight chromatic aberrations (appearing as magenta or green halos) are visible in challenging light conditions....

tommosack.wordpress.com

21/12/2010

Summary of the review

Canon EF 300mm f/4.0 L IS USM - Tom Mosack

The Canon EF 300mm f/4.0 L IS USM is a legendary prime telephoto lens praised for its exceptional image quality and robust build quality at an attractive price point compared to exotic super-telephotos. Weighing 1,190 grams, this reasonably compact lens features an innovative integrated sliding lens hood that deploys by pulling and screwing it into place, a highly efficient image stabilization (IS) system with two distinct modes, and a fast, quiet Ultra Sonic Motor (USM) autofocus system that supports full-time manual focus override. It is highly versatile, proving excellent for sports, wildlife, landscapes, and even close-up "proxiphotography" due to its remarkably short minimum focusing distance of just 1.5 meters. Additionally, it maintains full autofocus capabilities when paired with an EF 1.4x extender (becoming a 420mm f/5.6 lens), making it an adaptable alternative to heavier gear. However, the lens does have notable ergonomic and physical drawbacks. Its minimal tripod collar is uncomfortable for hand-held shooting and cannot be detached unless the lens is completely removed from the camera body. The provided semi-rigid carrying case is also criticized as impractical with a...

forum.lesnumeriques.com

19/06/2011

Summary of the review

[Single Topic] Canon EF300mm F4L IS USM - Les Numériques

The Canon EF 300mm f/4L IS USM is a professional-grade (L-series) telephoto lens released in March 1997 that provides a 480mm equivalent focal length when mounted on an APS-C sensor camera. Built with an entirely metallic body, 15 lens elements in 11 groups (including 2 UD elements), and an 8-blade diaphragm, it delivers impressive, heavy-duty build quality paired with a highly practical sliding integrated lens hood. Optically, the lens is highly praised for producing great sharpness starting right at its maximum f/4 aperture, reaching peak performance at f/5.6, while keeping optical defects like chromatic aberration and vignetting nearly nonexistent. Additionally, it offers surprising versatility, proving excellent not just for wildlife and sports photography, but also for close-up (proxy) photography due to its short 1.5-meter minimum focusing distance. However, because of its older design, the lens does suffer from a few notable drawbacks. Its built-in image stabilization only provides up to 2 stops of compensation and is reportedly quite noisy during operation. The ring-type USM autofocus motor, while generally quiet and smooth, is noticeably slower than the autofocus systems found in...

dxomark.fr

Mars 1997

Summary of the review

Canon EF 300mm f/4L IS USM Review and Tests

The DXOMARK evaluation of the Canon EF 300mm f/4L IS USM highlights it as a highly capable super-telephoto prime lens, offering a great balance of performance and value compared to its more expensive f/2.8 siblings. Originally launched in March 1997, it remains a robust option for wildlife and sports photography. On high-resolution camera bodies like the Canon EOS 5DS R, the lens achieves a respectable sharpness metric of 18 P-Mpix. A major standout feature in DXOMARK's measurements is its exceptional control over geometric distortion, yielding a near-perfect score of 0.2%. Additionally, vignetting is very well managed, dipping to a minimal -0.8 EV, ensuring relatively even frame illumination even when shooting wide open. However, the review also highlights several compromises that reveal the lens's older optical design age. Its primary drawback is its susceptibility to chromatic aberration, with measurements reaching 6 µm, which typically manifests as noticeable blue fringing around high-contrast edges or star fields. There is also a slight compromise in light transmission, as it drops to a measured 4.6 T-stop when wide open at f/4, meaning it lets in...

fotoloco.fr

17/10/2017

Summary of the review

Canon EF 300mm f/4L IS USM - Fotoloco

The Canon EF 300mm f/4L IS USM is a fixed telephoto lens belonging to Canon's premium "L" series, highly recommended for wildlife, sports, and alternative portrait photography. Optically, it inherits elite performance from its predecessor, delivering superb image quality and sharpness from its maximum aperture across the entire frame, with zero distortion and minimal vignetting. Its standout features include a built-in image stabilizer that allows sharp handheld shooting at speeds down to 1/100th of a second, an incredibly short 1.5-meter minimum focus distance perfect for close-up photography, and a highly precise, fast autofocus that excels in AI Servo mode. Additionally, the lens comes well-equipped with a tripod collar and a highly practical built-in lens hood that slides out from the barrel. On the downside, the lens presents a few notable drawbacks, starting with its price of approximately €1,350 new, which represents a steep investment for beginners and enthusiast photographers. A focal length of 300mm can also feel a bit short for small wildlife, such as birds, and the maximum aperture of f/4 may force users to increase their ISO settings...

digitalcamaralens.com

27/07/2026

Summary of the review

Canon EF 300mm f/4 L IS USM - Review and Test

The DigitalCamaraLens review details a comprehensive test of the Canon EF 300mm f/4 L IS USM, a veteran telephoto prime lens designed for sports and nature photography. Tested on full-frame (Canon 5D Mk II) and APS-C (Canon 50D) bodies, the reviewer praises its structural resilience and high-quality finishes, noting that its physical form has aged exceptionally well over fifteen years. The lens features a robust, metallic chassis, a built-in retractable lens hood, and internal focusing driven by a USM motor. However, its long market tenure shows in its internal mechanics, as its aging autofocus and first-generation image stabilization systems clearly show their age compared to contemporary alternatives. The primary pros highlighted in the review focus on its exceptional construction, featuring a durable lacquered metal exterior, smooth manual focus ring override, and a highly practical integrated lens hood that can lock into place by a simple reverse turn. On the downside, the major cons stem from its legacy SLR design. This includes a complete lack of a rubber weather-sealing gasket at the mount bayonet and noticeable performance degradation toward the extreme...

marcellosavoia.weebly.com

2014-2015 (est.)

Summary of the review

Canon EF 300 f/4 IS USM L: hands-on review

The Canon EF 300mm f/4 IS USM L is a compact and solid prime telephoto lens that offers outstanding professional-tier image quality. On the positive side, it features robust metallic construction, a fast and quiet Ultrasonic (USM) autofocus motor, and an innovative built-in sliding lens hood that simplifies handling. Optically, the lens delivers incredible sharpness even when shot wide open at f/4, showing minimal distortion or vignetting. Additionally, its maximum aperture allows photographers to pair it with a 1.4x teleconverter while successfully maintaining autofocus capabilities. However, the lens does come with some performance trade-offs, particularly regarding its dated Image Stabilization (IS) system. The reviewer notes that the IS mechanism is exceptionally noisy compared to other Canon lenses and practically yields only about one stop of stabilization. Performance also takes a slight hit when using a 1.4x multiplier; while still highly usable when stopped down to f/8, the pairing results in a noticeable reduction in sharpness and slower autofocus speeds. Finally, as a fixed focal length lens, it naturally lacks the framing versatility offered by telephoto zoom alternatives.

rcefoto.com

N/D

Summary of the review

Canon EF 300mm f/4.0 L IS USM - Used Review

The Canon EF 300mm f/4.0 L IS USM is a robust and highly durable telephoto lens that has maintained an excellent reputation since its release in 1997. Belonging to Canon’s prestigious L-series, it features a solid metal body construction that is weather-sealed against dust and moisture splashes. A major highlight of this lens is its exceptional image quality, producing sharp, high-contrast, and crystal-clear photos with vivid colors on both APS-C and Full Frame image sensors. Despite its age, the integrated image stabilization performs reliably well, while its 1.2 kg weight provides a well-balanced center of gravity that makes handheld shooting comfortable and easy. Additionally, it features an ultrasonic ring motor (USM) for focus, a built-in hood that locks securely, and a highly impressive macro reproduction ratio of 0.24, allowing photographers to get remarkably close to smaller subjects. However, the lens does have a few drawbacks to consider. While the autofocus system is highly responsive, it is noticeably slower compared to the advanced motors found in newer super-telephoto lenses, such as modern 500mm models. Furthermore, its overall autofocus performance heavily depends...

Video reviews

Best alternatives

Nikon AF-S NIKKOR 300mm F4E PF ED VR

Camera lenses

Pentax SMC DA 300mm F4 ED IF SDM

Camera lenses

Olympus Zuiko ED 150mm F2 0

Camera lenses

Sigma APO Macro 180mm F2 8 EX DG OS HSM

Camera lenses

Canon EF 180mm F 3 5L Macro USM

Camera lenses

Canon EF 200mm F 2 8L II USM

Camera lenses

Olympus Zuiko ED 300mm F2 8

Camera lenses

Nikon AF Micro NIKKOR 200mm F 4D IF ED

Camera lenses

Pentax SMC DA 200mm F 2 8 ED IF SDM

Camera lenses

Canon EF 400mm F 4 DO IS USM

Camera lenses

Sony FE 70 200mm F 2 8 GM OSS II

Camera lenses

Tamron SP 70 200mm F 2 8 Di VC USD G2

Camera lenses

Compare Canon EF 300mm F 4L IS USM with

Compare