Lens Lab
    Pentax smc D FA 645 25mm F4 AL (IF) SDM AW
    Pentax smc D FA 645 25mm F4 AL (IF) SDM AW

    Pentax smc D FA 645 25mm F4 AL (IF) SDM AW

    25mm · f/4

    Overview

    The Pentax smc D FA 645 25mm F4 is a weather-sealed ultra-wide lens for Pentax 645 medium format cameras. Optically, it offers good sharpness but has a low 0.11x magnification ratio, making it unsuitable for close-ups. Build quality is robust with AW (All Weather) sealing, though it lacks image stabilization. The lens is heavy at 1070g and has a fixed f/4 aperture. It suits landscape and architectural photographers who need a durable, weather-resistant wide-angle lens for medium format systems.