This telephoto lens, with a f/5.6 to f/45 aperture and a 35mm equivalent focal length of 118.5mm to 237mm, fits medium-format PENTAX 645 mount cameras. As you choose from a wide, versatile range of telephoto focal lengths, extra-low dispersion glass elements add high contrast to images and lessen chromatic aberrations.
While the lens internally focuses, a slide ring moving back and forth lets you adjust from auto to manual focus. Each allows for a minimum focus distance of 6.6 feet and a filter thread size of 67mm. Super Protect coating reduces scratches and makes the system easier to clean.