Pentax HD PENTAX-D FA 28050 21mm
Combining a 21mm ultra-wide perspective with a bright f/2.4 aperture and 4 ED elements, this lens delivers sharp, high-resolution images with uniform rendition across the full-frame field. Its weather-resistant construction and close 7.1" minimum focusing distance add practical versatility to the precision-machined Limited-series build. This optic is best for landscape and architectural photographers using Pentax K-mount DSLRs who need durable, all-weather performance.
Focal length 21mm
Aperture f/22
Mount Pentax K
Weather Sealed 是
Weight 416 g
af type Autofocus
lens type wide-angle
56 综合评分
价格 £778
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实测数据
性能表现
规格参数
完整规格参数
Optics
| Type | Wide-angle |
| Focal Length Min | 21 |
| Focal Length Max | 21 |
| Elements | 11 |
| Groups | 8 |
| Aspherical Elements | 1 |
| ED Elements | 4 |
| Coating | High-Grade Multi-Layer HD Coating |
Aperture
| Max Aperture | f/22 |
| Min Aperture | f/2.4 |
| Constant | Yes |
| Diaphragm Blades | 8 |
Build
| Mount | Pentax K |
| Format | full-frame |
| Weather Sealed | Yes |
| Weight | 0.4 kg / 0.9 lbs |
| Filter Thread | 67 |
AF & Stabilization
| AF Type | Autofocus |
| Stabilization | No |
Focus
| Min Focus Distance | 180 |
| Max Magnification | 1:3.85 |
竞品对比
| Spec | Pentax HD PENTAX-D FA 28050 21mm | Sigma Contemporary 18-50mm f/2.8 DC DN | Tamron Di III 17-70mm f/2.8 Di III-A VC RXD | Nikon NIKKOR Z 17-28mm f/2.8 | Panasonic Leica DG Vario-Elmarit H-ES12035 | Sony E 18-135mm f/3.5-5.6 OSS |
|---|---|---|---|---|---|---|
| Focal Length | 21mm | 18-50mm | 17-70mm | 17-28mm | 12-35mm | 18-135mm |
| Max Aperture | f/22 | f/2.8 | f/2.8 | f/2.8 | f/2.8 | f/3.5 |
| Mount | Pentax K | Sony E | Sony E | Nikon Z | Micro Four Thirds | Sony E |
| Stabilization | false | false | true | false | true | true |
| Weather Sealed | true | true | true | true | true | false |
| Weight (g) | 416 | 290 | 544 | 450 | 306 | 326 |
| AF Type | Autofocus | stepping motor | RXD | Stepping Motor | Autofocus | Linear motor |
| Lens Type | wide-angle | zoom | zoom | zoom | zoom | zoom |
| Compare | Compare | Compare | Compare | Compare |
| 产品 | AF | Bokeh | Build | Macro | Optical | Aperture | User Sentiment | Versatility | 用户口碑 | Stabilization |
|---|---|---|---|---|---|---|---|---|---|---|
| Pentax HD PENTAX-D FA 28050 21mm | 53.7 | 17.9 | 77.6 | 86.5 | 76.5 | 19.8 | 63.7 | 33.7 | 60.8 | 36.7 |
| Sigma Contemporary 18-50mm f/2.8 DC DN Compare | 86.8 | 81.1 | 86.4 | 91.4 | 82.4 | 83.3 | 80.9 | 78.6 | 90.2 | 36.7 |
| Tamron Di III 17-70mm f/2.8 Di III-A VC RXD Compare | 53.7 | 86.4 | 69 | 85.5 | 91.2 | 83.3 | 63.7 | 89.6 | 86 | 82.4 |
| Nikon NIKKOR Z 17-28mm f/2.8 Compare | 86.8 | 86.4 | 75.6 | 85.5 | 88.3 | 83.3 | 91.2 | 68.1 | 70.8 | 36.7 |
| Panasonic Leica DG Vario-Elmarit H-ES12035 Compare | 53.7 | 81.1 | 85.7 | 50.7 | 86.6 | 83.3 | 63.7 | 80.6 | 86 | 96.9 |
| Sony E 18-135mm f/3.5-5.6 OSS Compare | 98 | 74.6 | 72.9 | 40.3 | 78.7 | 76.6 | 44.7 | 95.8 | 90.2 | 82.4 |
价格
性价比分析
最低 £778
