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Pentax smc HD D FA 15-30mm f/2.8 ED SDM WR
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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. Ultrasonic AFLenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses. No stepping motor AFLenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses. One or more Low Dispersion lens element is usedLow Dispersion lens elements help to reduce chromatic aberration. Metal mountCheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important. No Internal ZoomInternally zooming lenses don't change their size while focal length is changing. The front lens is fixedThe fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier. Weather SealedWeather sealed lenses are protected from dust and water. While they are not water proof, these lenses can be used in rain and other humid environments. Some sealings only provide protection against dust or water, not both. Sealing is only available when the lens is used on a similarly weather sealed camera body. |
Pentax smc HD D FA 15-30mm f/2.8 ED SDM WR Specification
| Available mount(s) | Pentax K |
| Application(s) | Landscape, Interiors, Architecture |
| Category(s) | Wide angle zoom |
| Multiplier | 1× |
| Stabilizer | N/A |
| Focal length | 15 - 30 mm (2× zoom) |
| Lens construction | 18 elements in 13 groups |
| Angle of view |
35mm: 111-72° digital: 86-50° |
| Number of blades | 9 |
| Maximum aperture | wide: f/2.8 tele: f/2.8 |
| Minimum aperture | wide: f/22 tele: f/22 |
| Minimum focusing distance | 28 cm |
| Magnification | 0.2× |
| Filter size | N/A |
| Size | ∅ 98.5 × 143.5 mm |
| Weight | 1040 g |
| Notes |
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| AF speed | N/A |
| AF sound | |
| Internal focusing | N/A |
| Internal zoom | no |
| Fix front lens | yes |
| Mount type | metal |
| Weather sealed | yes |
| Drop in filter | N/A |
| Ultrasonic AF | yes |
| Stepping motor AF | no |
| APS-C sized circle | no |
| Low dispersion lens element | yes |
| Hard case | N/A |
| Soft case | N/A |
| Lens hood | N/A |
| Tripod adapter | N/A |
Pentax smc HD D FA 15-30mm f/2.8 ED SDM WR Reviews
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