Pentax-DA* 50-135mm F2.8 Review
Specifications
The Pentax DA* 50-135mm zoom lens is designed exclusively for digital cameras and only covers the APS-C image circle. It will function and autofocus on film SLRs that do not require an aperture ring, but you will experience significant vignetting due to the insufficient lens circle.
Below are the official specifications for the 50-135mm:
| Lens Name | SMC PENTAX-DA* 50-135mm F2.8 ED [IF] SDM |
| Optical Formula | 18 elements in 14 groups. Multiple ED elements |
| Image Circle | APS-C Only |
| Autofocus | Built-In SDM Motor (w/ K10D or newer) Traditional Screwdrive (w/ K100D or older) |
| Field of View | 27° to 10° horizontal, 31.5° to 11.9° diagonal |
| Aperture Range | F2.8 - F22 |
| Aperture Blades | 9 |
| Aperture Ring | N/A |
| Max. Magnification | 0.17x |
| Minimum Focusing Distance | 100cm (39.6in) |
| Internal Focus | Yes (also internal zooming) |
| Quick Shift | Yes |
| Filter Diameter | 67mm |
| Cap | O-LC67, included, plastic pinch type |
| Hood | PH-RBK 67mm, included, petal-style Weight: 80g (2.8oz) |
| Case | S90-160, included, soft case |
| Diameter x Length | 77 x 136mm (3 x 5.4 in) |
| Weight | 685g (24.2 oz) |
| Mount Designation | KAF2 |
| Weather Sealing | Yes |
| Price | MSRP / At launch: $1599.95 (US) Street value: $800-900 (US)* |
As this is a DA-series lens, modern Pentax DSLRs will support in-camera distortion and aberration correction when this lens is mounted.
The front element of this lens is treated with Pentax's Super Protect (SP) coating, making it more resitatnt to dust and scratches, and easier to clean.
*more details on the value page of this review.
