Overview

The Pentax smc DA 40mm F2.8 Limited is an ultra-thin pancake lens with excellent build quality, featuring an all-metal construction. Optically, it delivers very sharp center performance at f/2.8 and becomes sharp across the frame by f/8, with well-controlled chromatic aberrations. Weaknesses include corner softness at wider apertures and some vignetting wide open. The screw-drive AF is fast but noisy. It suits Pentax APS-C DSLR users seeking a compact, high-quality standard lens, and works on full-frame with manual crop setting.