Pentax-DA* 50-135mm F2.8 Review


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. PentaxForums +Pentax Forums @PentaxForums News | Reviews | Forum

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