The SMC Pentax FA* 645 300mm f/4 ED IF is a professional-grade autofocus telephoto lens designed for the Pentax 645 medium format system. The Star (*) designation indicates Pentax's highest optical standard within the FA lens lineup, reserved for lenses meeting exceptional performance criteria. The FA* classification identifies this lens as part of Pentax's elite optical lineup, indicating superior resolution, contrast, and overall optical performance compared to standard FA lenses. Star lenses were designed to meet the demands of professional medium format photography. The ED designation indicates the use of Extra-low Dispersion optical elements, minimizing chromatic aberration at the 300mm focal length where it is typically most pronounced. This results in high contrast, accurate colo.
