Pentax HD DA 21mm F3 2 AL Limited Review | 54 Data compared

The ePHOTOzine review of the HD PENTAX-DA 21mm f/3.2 AL Limited highlights it as a compact, premium pancake prime for APS-C, boasting exceptional all-metal build quality, lightweight handling, and superior contrast due to HD coating. While delivering excellent center sharpness at f/3.2 and outstanding edge-to-edge resolution at f/8, the lens shows low, acceptable distortion for a wide-angle, fast autofocus, and great color rendition. Conversely, the review notes significant limitations, specifically weak edge performance when shooting at the maximum f/3.2 aperture. Furthermore, the lens suffers from visible chromatic aberration at the edges and noticeable corner vignetting at wide apertures, along with a high price point compared to standard alternatives.

The Pentax HD DA 21mm f3.2 AL Limited is a compact "pancake" prime lens designed for APS-C sensor DSLRs, offering a 32mm full-frame equivalent focal length. Weighing just 0.30 lb (134g) and measuring 1 inch in length, this all-metal aluminum alloy lens features an updated rounded diaphragm and nano-tech HD multi-layer coatings. When tested on a 24-megapixel Pentax K-3, it achieved a DxOMark score of 18 points. The review notes that while it performs similarly to its smc predecessor, the new HD coatings successfully increase light transmittance, improve peripheral illumination uniformity, and lower lateral chromatic aberration between the maximum aperture and f/5.6. The lens has distinct pros and cons regarding its build and performance. On the positive side, its major strengths are its highly portable, lightweight build, low distortion, well-controlled vignetting, and improved sharpness uniformity over the older model when shooting between initial aperture and f/5.6. On the negative side, its peak sharpness score of 11 P-Mpix is somewhat disappointing for a prime lens, and chromatic aberration proves troublesome in the outer 50% of the frame and extreme corners. Ultimately,...

The Pentax HD DA 21mm F3.2 AL Limited is a compact, well-crafted, all-metal pancake lens designed for APS-C Pentax SLRs, offering a desirable wide field of view and consistent illumination. Its strengths include high-quality build materials, a premium lens hood, and the Quick Shift system for effortless manual focus adjustments. However, the lens is not notably sharp when shooting wide open at f/3.2, requiring photographers to stop down to f/4 or f/5.6 for optimal, crisp images. While it also exhibits roughly 1.7% barrel distortion, it is a suitable choice for users prioritizing portability, though the HD DA 20-40mm Limited zoom is suggested for better sharpness and weather sealing.

The HD Pentax-DA 21mm F3.2 AL Limited is praised by PentaxForums for its exceptional, compact "pancake" design and robust build quality, making it an ideal, discreet walk-around lens with 31.5mm equivalent field of view on APS-C. It delivers high center sharpness, strong micro-contrast, and excellent flare resistance due to HD coatings, plus versatile 20cm close-focusing capabilities. Conversely, the lens shows soft corners, noticeable vignetting, and chromatic aberration at maximum f/3.2 aperture, necessitating stopping down to f/5.6-f/8 for peak landscape performance. Other limitations include a relatively slow aperture, an audible screw-drive AF system, and roughly 2% barrel distortion, according to the review.

The HD Pentax-DA 21mm f/3.2 AL Limited lens is praised for its ultra-compact, premium aluminum build, and exceptional handling, which includes a smooth, non-rotating focus ring. It delivers excellent sharpness, high contrast, and strong flare resistance, with a practical 20cm minimum focus distance. However, it features a loud, screw-driven autofocus system, and the manual focus ring rotates during AF. Additionally, the lens exhibits softness and vignetting at f/3.2, requiring it to be stopped down for optimal performance.

📸 Small Build, Big Compromises The Pentax HD DA 21mm F3.2 AL Limited is an ultra-compact pancake lens built like a tank but limited by its wide-open performance. On the plus side, its robust all-metal construction, lightweight 4.2-ounce body, and tiny 1 by 2.5-inch footprint make it incredibly pocketable. It delivers a wide 31.5mm equivalent field of view, boasts an impressive 7.9-inch close-focusing distance, and offers fairly even illumination across the frame. However, the lens suffers from notable flaws, including a disappointing lack of sharpness when shooting wide open at f/3.2, 1.7% barrel distortion, and a push-on metal cap that easily falls off if the lens hood is removed. ⚖️ The Verdict & Better Alternatives While it earned a "Good" 3.5-star rating, this $699.95 prime lens requires you to stop down to f/4 or ideally f/5.6 to get truly sharp, edge-to-edge images. If you value a miniature setup, it remains a solid choice for Pentax SLRs. For those willing to carry a larger setup, reviewer Jim Fisher recommends skipping this pancake prime for superior alternatives. The weather-sealed Pentax HD DA...

The Pentax HD DA 21mm F3.2 AL Limited is a compact wide-angle prime lens designed for APS-C SLRs, offering a 31.5mm equivalent field of view. Its standout features are its premium all-metal build quality and remarkably small "pancake" design, measuring just 1 by 2.5 inches and weighing only 4.2 ounces. The lens includes a unique hood that supports 43mm filters and a "Quick Shift" focus system that allows for manual fine-tuning while in autofocus mode. While it is portable and well-constructed, it lacks weather sealing and is primarily intended for APS-C use, as mounting it on full-frame cameras like the K-1 results in heavy vignetting and black corners unless used in crop mode. In terms of performance, the lens receives a "Good" 3.5 rating but has notable optical trade-offs at its widest settings. The primary cons include disappointing sharpness at f/3.2—falling short of the 1,800-line benchmark—and visible barrel distortion of approximately 1.7 percent. Additionally, RAW shooters will encounter significant corner falloff (vignetting) at wide apertures. Conversely, the pros shine when the lens is stopped down; at f/5.6, it delivers crisp,...