"This medium-format, manual, autofocusing telephoto prime lens with a 35mm-equivalent focal length of 200mm assists with creating high-contrast, clear images, all while reducing extension when focusing. PENTAX's Super Multi Coating was added to the surface to create sharp photographs, while Extra-low Dispersion (ED) elements reduce chromatic aberrations to enhance quality. Inner Focus (IF) functionality decreases lens extension during focusing, allowing for improved balance, smoother focus ring operation, and a closer minimum focus distance. Features a compact f/4.0 aperture and lens developed with computer-assisted optical design technology for a higher degree of precision. Autofocusing telephoto prime lens with a 35mm-equivalent focal length of 200mm. Treated with PENTAX's Super Multi Coating (SMC) for sharp, high-contrast images. Extra-low Dispersion (ED) lens elements assure high image quality by minimizing chromatic aberrations. Inner Focus (IF) mechanism minimizes lens extension when focusing, maintaining good balance and assuring smoother focus ring operation and a closer minimum focus distance of 7.22'"