Pentax SMC Pentax-FA 645 300mm f/4 ED [IF]

The Pentax SMC FA 645 300mm f/4 is a medium format, manual and autofocusing telephoto prime lens with a 35mm-equivalent focal length of 200mm. The surface is treated with Pentax's Super Multi Coating for sharp, high-contrast images. Extra-low Dispersion (ED) lens elements assure high image quality by Minimizing chromatic aberrations. The Inner Focus (IF) mechanism Minimize s lens extension when focusing, maintaining good balance and assuring smoother focus ring operation and a closer minimum focus distance. The lens was developed using computer-assisted optical design technology for a high degree of precision.