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Pentax smc A 20mm f/2.8
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Full frame sized imageLenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either. No stepping motor AFLenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses. No Low Dispersion lens element is usedLow Dispersion lens elements help to reduce chromatic aberration. Not stabilizedImage stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule. |
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The PENTAX smc P-A 20mm F2.8 is a manual focus lens with automatic aperture control. It provides a very wide angle of coverage and is well-suited for architectural and landscape photography. Weighing a mere 8.6 ounces, its compact and lightweight design also make it ideal for traveling. Like all PENTAX lenses, this lens is treated with the acclaimed smc coating for maximum light transmission, sharp definition, and high contrast while minimizing flare and ghost imaging.
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Pentax smc A 20mm f/2.8 Specification
| Available mount(s) | Pentax K |
| Application(s) | Landscape, Interiors, Architecture |
| Category(s) | Ultra-wide prime |
| Multiplier | 1× |
| Stabilizer | no |
| Focal length | 20 mm (prime) |
| Lens construction | 10 elements in 9 groups |
| Angle of view |
35mm: 94° digital: N/A |
| Number of blades | N/A |
| Maximum aperture | f/2.8 |
| Minimum aperture | f/22 |
| Minimum focusing distance | 24 cm |
| Magnification | N/A |
| Filter size | 67 mm |
| Size | ∅ 71 × 43 mm |
| Weight | 245 g |
| Notes |
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| AF speed | N/A |
| AF sound | |
| Internal focusing | N/A |
| Internal zoom | N/A |
| Fix front lens | N/A |
| Mount type | N/A |
| Weather sealed | N/A |
| Drop in filter | N/A |
| Ultrasonic AF | N/A |
| Stepping motor AF | no |
| APS-C sized circle | no |
| Low dispersion lens element | no |
| Hard case | N/A |
| Soft case | N/A |
| Lens hood | N/A |
| Tripod adapter | N/A |
| Discontinued | yes |
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