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Canon RF 400mm F 2 8L IS USM Review | 54 Data compared

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  • Avg. price in UK: ~£12,060
  • Avg. price in US: ~$12,000
  • Lens mount: Canon RF
  • Maximum focal length: 400 mm
  • Maximum aperture (telephoto end): 2.8
  • Optical image stabilization: yes
  • Maximum angle of view: 6.2 °

Canon RF 400mm F 2 8L IS USM review. Compare 54 technical specifications and user reviews to see how it ranks among camera lenses and if it is worth buying.

8.0

Overall score

What it is: An overall evaluation of the camera lens's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best camera lenses on the market.

Score components:

80.0%

8.0

Technical Score

20.0%

?

User score

Excellent
8.0

Technical Score

What it is: An assessment of the camera lens's technical performance, covering eight key areas: sharpness, aperture flexibility, autofocus, stabilization, build quality, mount compatibility, close-focus performance, and design.

When it matters: When you want to compare camera lenses based on technical performance and available features.

Score components:

35.0%

8.4

Optics & Aperture

24.0%

7.7

Build & Handling

20.0%

6.6

Focus & Controls

10.0%

9.0

Lab Scores

8.0%

8.8

Stabilization

3.0%

10

Mount & Format

Excellent
?

User score

What it is: A rating that combines user reviews and the total number of reviews received by the camera lens.

When it matters: When real-world owner satisfaction and review volume matter to your decision.

Score components:

70.0%

?

User reviews

30.0%

?

Popularity

  • 9.9
    Low-light photography

    Score components:

    70.0%

    9.8

    Maximum aperture (telephoto end)

    30.0%

    10

    Optical image stabilization

  • 6.0
    Travel

    Score components:

    30.0%

    3.9

    Lens length

    25.0%

    1.4

    Lens diameter

    25.0%

    10

    Weather sealing (splashproof)

    20.0%

    10

    Optical image stabilization

  • No image
No image

Best prices in UK

    N/A~ £12,060

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The Canon RF 400mm f/2.8L IS USM is a professional-grade super-telephoto prime lens featuring a fast f/2.8 maximum aperture, a 9-blade circular diaphragm for smooth bokeh, and a 2.5m minimum focusing distance. Its advanced optical construction includes 17 elements in 13 groups with two fluorite and one Super UD element to minimize aberrations, alongside Air Sphere and Super Spectra coatings to reduce flare and ghosting. Key pros include lightning-fast Dual Power Focus Drive autofocus, up to 5.5 stops of optical image stabilisation, and a rugged, weather-sealed L-series build that is significantly lighter than its predecessors at 2.89kg. However, the primary cons are its extremely high price point, large physical footprint that may require specialized transport, and the lack of a built-in customizable control ring found on other RF lenses.

Technical Specifications of Canon RF 400mm F 2 8L IS USM

Technical Score

What it is: An assessment of the camera lens's technical performance, covering eight key areas: sharpness, aperture flexibility, autofocus, stabilization, build quality, mount compatibility, close-focus performance, and design.

When it matters: When you want to compare camera lenses based on technical performance and available features.

Score components:

35.0%

?

Optics & Aperture

24.0%

?

Build & Handling

20.0%

?

Focus & Controls

10.0%

?

Lab Scores

8.0%

?

Stabilization

3.0%

?

Mount & Format

8.0
Canon RF 400mm F 2 8L IS USM has a technical score of 8.01 points, which is higher than 88.9% of camera lenses.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the camera lens.

When it matters: When real-world owner satisfaction and review volume matter to your decision.

Score components:

70.0%

0.0

User reviews

30.0%

1.0

Popularity

?
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.
1.0
Canon RF 400mm F 2 8L IS USM has a popularity of 1 points, which is lower than 90% of products in this category.
Ratio quality/price

What it is: An indicator that combines the camera lens's overall rating with its cost.

When it matters: When you want to know how much overall quality you get for the price.

Score components:

60.0%

8.0

Overall score

40.0%

1.0

Price

5.9
Canon RF 400mm F 2 8L IS USM has a quality-to-price ratio of 5.9 points, which is lower than 87.7% of products in this category.
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 RF
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

?
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

yes
Canon RF 400mm F 2 8L IS USM supports teleconverters. 15.2% of camera lenses support teleconverters.
Supports RF 1.4x and RF 2x extenders.
Show more
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

400 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

400 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

6.2 °
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

6.2 °
Show more
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

2.5 m
Canon RF 400mm F 2 8L IS USM focuses as close as 2.5 m, which is farther than 97% of camera lenses and equal to 0.6% of camera lenses.
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

0.17x
Canon RF 400mm F 2 8L IS USM reaches a reproduction ratio of 0.17x, which is lower than 56.8% of camera lenses and equal to 4.2% of camera lenses.
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

yes
Canon RF 400mm F 2 8L IS USM supports full-time manual focus. 68.3% of camera lenses support full-time manual focus.
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

yes
Canon RF 400mm F 2 8L IS USM supports internal focusing. 83.6% of camera lenses support internal focusing.
Show more
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

yes
Canon RF 400mm F 2 8L IS USM supports optical image stabilization. 28.9% of camera lenses include optical image stabilization.
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

5.5 stops
Canon RF 400mm F 2 8L IS USM offers 5.5 stops of stabilization, which is stronger than 90.1% of camera lenses and equal to 6.5% of camera lenses.
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

3,130 g
Canon RF 400mm F 2 8L IS USM weighs 3,130 g, which is heavier than 98.2% of camera lenses.
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

367 mm
Canon RF 400mm F 2 8L IS USM is 367 mm long, which is longer than 98.2% of camera lenses.
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

163 mm
Canon RF 400mm F 2 8L IS USM has a diameter of 163 mm, which is wider than 98.9% of camera lenses and equal to that of 0.4% of camera lenses.
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

yes
Canon RF 400mm F 2 8L IS USM supports weather sealing. 50.2% of camera lenses support weather sealing.
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

yes
Canon RF 400mm F 2 8L IS USM uses a metal lens mount. 93.1% of camera lenses use a metal lens mount.
Show more
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 RF 400mm F 2 8L IS USM vs the average camera lens

  • Has optical image stabilization
    Canon RF 400mm F 2 8L 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 RF 400mm F 2 8L IS USM has optical image stabilization, the average camera lens does not. 29% of camera lenses include optical image stabilization.
  • Teleconverter compatible
    Canon RF 400mm F 2 8L IS USM supports teleconverters, while the average camera lens does not.
    Supports RF 1.4x and RF 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 RF 400mm F 2 8L IS USM supports teleconverters, while the average camera lens does not.
  • Has focus hold button
    Canon RF 400mm F 2 8L IS USM has a focus hold button, the average camera lens does not. 16.5% of camera lenses include a focus hold button.
    What it is: A button on the lens barrel used to lock focus temporarily during shooting.
    When it matters: When you want to lock focus quickly during sports, wildlife, or recomposed portraits.

    Importance: MEDIUM

    Canon RF 400mm F 2 8L IS USM has a focus hold button, the average camera lens does not. 16.5% of camera lenses include a focus hold button.
  • 1.5 stops stronger stabilization
    Canon RF 400mm F 2 8L IS USM has a higher stabilization effectiveness than the average camera lens (5.5 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 RF 400mm F 2 8L IS USM has a higher stabilization effectiveness than the average camera lens (5.5 stops vs 4 stops). The average lens has stabilization effectiveness of 4 stops.5.5 stops vs 4 stops
  • 2 more fluorite elements
    Canon RF 400mm F 2 8L IS USM has more fluorite elements than the average camera lens (2 vs 0). The average lens has 0 fluorite elements.
    What it is: Premium optical elements that help suppress chromatic aberration while keeping image quality high.
    When it matters: When you are comparing premium telephoto lenses where chromatic aberration control is especially important.

    Importance: MEDIUM

    Canon RF 400mm F 2 8L IS USM has more fluorite elements than the average camera lens (2 vs 0). The average lens has 0 fluorite elements.2 vs 0
  • Has drop-in filter support
    Canon RF 400mm F 2 8L IS USM supports drop-in or rear filters, while the average camera lens does not.
    52 mm drop-in filter.
    What it is: Support for filters placed behind the rear element instead of on the front thread.
    When it matters: When you use large super-telephoto lenses where front filters would be expensive or impractical.

    Importance: LOW

    Canon RF 400mm F 2 8L IS USM supports drop-in or rear filters, while the average camera lens does not.
  • Has focus limiter switch
    Canon RF 400mm F 2 8L IS USM has a focus limiter switch, the average camera lens does not. 16.4% of camera lenses include a focus limiter switch.
    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 RF 400mm F 2 8L IS USM has a focus limiter switch, the average camera lens does not. 16.4% of camera lenses include a focus limiter switch.
  • Newer release date
    Canon RF 400mm F 2 8L IS USM was released more recently than the average camera lens.
    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 RF 400mm F 2 8L IS USM was released more recently than the average camera lens.2021 vs 2016
  • Teleconverter compatible
    Canon RF 400mm F 2 8L IS USM supports teleconverters, while the average camera lens does not.
  • Has drop-in filter support
    Canon RF 400mm F 2 8L IS USM supports drop-in or rear filters, while the average camera lens does not.
  • 2 more fluorite elements
    Canon RF 400mm F 2 8L IS USM has more fluorite elements than the average camera lens (2 vs 0). The average lens has 0 fluorite elements.
  • Has focus hold button
    Canon RF 400mm F 2 8L IS USM has a focus hold button, the average camera lens does not. 16.5% of camera lenses include a focus hold button.
  • Has focus limiter switch
    Canon RF 400mm F 2 8L 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 RF 400mm F 2 8L IS USM has optical image stabilization, the average camera lens does not. 29% of camera lenses include optical image stabilization.
  • 1.5 stops stronger stabilization
    Canon RF 400mm F 2 8L IS USM has a higher stabilization effectiveness than the average camera lens (5.5 stops vs 4 stops). The average lens has stabilization effectiveness of 4 stops.
  • Newer release date
    Canon RF 400mm F 2 8L IS USM was released more recently than the average camera lens.

Total
Mount & Format
Optics & Aperture
Focus & Controls
Stabilization
Build & Handling
  • 2 fewer aspherical elements
    Canon RF 400mm F 2 8L IS USM has fewer aspherical elements than the average camera lens (0 vs 2). The average lens has 2 aspherical elements.
  • 1 fewer low-dispersion elements
    Canon RF 400mm F 2 8L IS USM has fewer low-dispersion elements than the average camera lens (1 vs 2). The average lens has 2 low-dispersion elements.
    Also includes 2 fluorite elements.
  • 2.2 m longer minimum focus distance
    Canon RF 400mm F 2 8L IS USM has a higher minimum focus distance than the average camera lens (2.5 m vs 0.3 m). The average lens has a minimum focus distance of 0.3 m.
  • 2,604.6 g heavier
    Canon RF 400mm F 2 8L IS USM is heavier than the average camera lens (3,130 g vs 525.4 g). The average lens weighs 525.4 g.
  • 275 mm longer lens
    Canon RF 400mm F 2 8L IS USM is longer than the average camera lens (367 mm vs 92 mm). The average lens has a length of 92 mm.
  • 86 mm wider lens barrel
    Canon RF 400mm F 2 8L IS USM is wider than the average camera lens (163 mm vs 77 mm). The average lens has a diameter of 77 mm.
  • 2,604.6 g heavier
    Canon RF 400mm F 2 8L IS USM is heavier than the average camera lens (3,130 g vs 525.4 g). The average lens weighs 525.4 g.
    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

    Canon RF 400mm F 2 8L IS USM is heavier than the average camera lens (3,130 g vs 525.4 g). The average lens weighs 525.4 g.3130 g vs 525.4 g
  • 275 mm longer lens
    Canon RF 400mm F 2 8L IS USM is longer than the average camera lens (367 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 RF 400mm F 2 8L IS USM is longer than the average camera lens (367 mm vs 92 mm). The average lens has a length of 92 mm.367 mm vs 92 mm
  • 86 mm wider lens barrel
    Canon RF 400mm F 2 8L IS USM is wider than the average camera lens (163 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 RF 400mm F 2 8L IS USM is wider than the average camera lens (163 mm vs 77 mm). The average lens has a diameter of 77 mm.163 mm vs 77 mm
  • 2.2 m longer minimum focus distance
    Canon RF 400mm F 2 8L IS USM has a higher minimum focus distance than the average camera lens (2.5 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 RF 400mm F 2 8L IS USM has a higher minimum focus distance than the average camera lens (2.5 m vs 0.3 m). The average lens has a minimum focus distance of 0.3 m.2.5 m vs 0.3 m
  • 2 fewer aspherical elements
    Canon RF 400mm F 2 8L IS USM has fewer aspherical elements than the average camera lens (0 vs 2). The average lens has 2 aspherical elements.
    What it is: Specially shaped lens elements used to reduce distortion and improve sharpness with fewer optical compromises.
    When it matters: When edge sharpness and lower distortion matter in wide-angle, travel, or everyday shooting.

    Importance: MEDIUM

    Canon RF 400mm F 2 8L IS USM has fewer aspherical elements than the average camera lens (0 vs 2). The average lens has 2 aspherical elements.0 vs 2
  • 22.75x more expensive
    Canon RF 400mm F 2 8L IS USM is more expensive than the average camera lens (£12,060 vs £530).
    Canon RF 400mm F 2 8L IS USM is more expensive than the average camera lens (£12,060 vs £530).£12,060 vs £530
  • 1 fewer low-dispersion elements
    Canon RF 400mm F 2 8L IS USM has fewer low-dispersion elements than the average camera lens (1 vs 2). The average lens has 2 low-dispersion elements.
    Also includes 2 fluorite elements.
    What it is: Optical elements designed to reduce color fringing by controlling how different wavelengths focus.
    When it matters: When you want cleaner edges and less color fringing in high-contrast scenes.

    Importance: MEDIUM

    Canon RF 400mm F 2 8L IS USM has fewer low-dispersion elements than the average camera lens (1 vs 2). The average lens has 2 low-dispersion elements.1 vs 2
  • 6.38x less popular
    Canon RF 400mm F 2 8L IS USM is less popular than the average camera lens (1.00 vs 6.383).
    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.
    Canon RF 400mm F 2 8L IS USM is less popular than the average camera lens (1.00 vs 6.383).1 vs 6.38
Total
Overall
Optics & Aperture
Focus & Controls
Build & Handling

Graphic comparison of Canon RF 400mm F 2 8L IS USM and

Attribute category
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Third-party reviews

What customers like about Canon RF 400mm F 2 8L IS USM?

  • Exceptional image quality with razor-sharp results even at wide f/2.8 aperture
  • Lightning-fast and accurate autofocus, ideal for high-speed action like motorsports and birds in flight
  • Significant weight reduction (approx. 2.89kg / 6.4lbs) compared to predecessors, improving portability and reducing fatigue
  • Excellent 5.5-stop Image Stabilization that integrates effectively with EOS R-series In-Body Image Stabilization
  • Full compatibility with RF 1.4x and 2x teleconverters with minimal impact on image quality or focus speed
  • Robust L-series build quality with extensive weather sealing and heat-reflecting white finish

What customers dislike about Canon RF 400mm F 2 8L IS USM?

  • Extremely high price point (approx. $12,000–$13,000), making it a significant investment
  • Fixed 400mm focal length lacks the versatility of a zoom lens for changing subject distances
  • Lacks the dedicated customizable control ring found on most other Canon RF lenses
  • Optical design is virtually identical to the EF 400mm f/2.8L IS III, offering little upgrade for owners of that specific model
  • Size and large front element make it cumbersome for general 'walk-around' photography or travel

Expert reviews

C
cameralabs.com
20/07/2021
Summary of the review
Canon RF 400mm f2.8L RF 600mm f4L review
T
the-digital-picture.com
25/01/2024
Summary of the review
Canon RF 400mm F2.8 L IS USM Lens Review
D
digitalcameraworld.com
20/04/2024
Summary of the review
Canon RF 400mm f/2.8L IS USM review: if it ain't broke, don't fix it
P
petapixel.com
20/07/2021
Summary of the review
Review of the Canon RF400mm f/2.8L and RF600mm f/4L Lenses
F
fotowissen.eu
17/02/2026
Summary of the review
The Best Canon Lenses Review 2026
(Translated)Show original
P
phototrend.fr
02/12/2022
Summary of the review
Canon RF 400mm f/2.8L IS USM: Hands-on with the sports super-telephoto lens
(Translated)Show original
C
cdn.dday.it
19/04/2021
Summary of the review
Preview/Review RF 400mm
(Translated)Show original

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