Lens Lab
    Pentax SMC-M* 67 400 mm f/ 4 ED (IF)
    Pentax SMC-M* 67 400 mm f/ 4 ED (IF)

    Pentax SMC-M* 67 400 mm f/ 4 ED (IF)

    400mm · f/4

    Overview

    The Pentax SMC-M* 67 400 mm f/4 ED (IF) is a medium format telephoto lens praised for exceptional sharpness, even with 1.4x and 2x teleconverters. It features low dispersion glass for reduced chromatic aberration and a manageable weight compared to larger super-telephotos. Build quality is solid, but the lens is expensive, often found used. It suits wildlife photographers needing a relatively portable, fast, and sharp lens, though performance degrades at small apertures like f/32.