Overview

The HD Pentax DA 40mm F2.8 Limited is a pancake lens for APS-C Pentax DSLRs, praised for its compact all-metal build and unique rendering. Optically, it offers very low chromatic aberration and good distortion/vignetting control, but sharpness is only moderate wide-open, improving when stopped down to a peak of 8-Mpix at f/5.6. It uses a screw-drive AF and is very lightweight. It suits Pentax users seeking a tiny, high-quality normal lens, especially for street photography, though it may not satisfy those needing edge-to-edge sharpness wide open.