Pentax 135mm F/2.8 SMC FA IF K Mount Autofocus Lens Review

The Pentax 135mm F/2.8 SMC FA IF is a compact telephoto prime designed for Pentax K-mount DSLRs and film bodies. With a fast F/2.8 maximum aperture and internal focusing, it offers a classic focal length for portraits, street photography, and detail work. The SMC (Super Multi-Coating) treatment helps control flare and ghosting, while the 52mm filter thread keeps the lens relatively portable for its class.

At $265 MSRP, this lens occupies the mid-tier of Pentax's FA lineup, balancing optical quality with affordability. The internal focusing mechanism means the front element doesn't rotate or extend during use, which is convenient for use with filters. It's a straightforward autofocus lens that fits well into the Pentax ecosystem, particularly for photographers seeking a traditional telephoto perspective without the bulk or cost of longer focal lengths.