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.

This lens has a construction of 15 elements in 13 groups that is designed for high quality images. It even has extra-low dispersion glass elements that minimize the effects of chromatic aberrations and provide high contrast images for maximum resolution. This is all protected by a Super Protect (SP) coating on the front element that lessens the possibility of scratches and makes it easier to clean.

During operation, the lens internally focuses, keeping the large lens as compact as possible, and it switches from auto to manual focus by sliding the focus ring forward or backward. The lens also has a minimum focus distance of 6.6 and a filter thread size of 67mm.

Aperture range of f/5.6 to f/45

Angle of view of 21° to 10.5° which equates to 17° to 8.5° on Pentax 645 digital cameras

Lens construction of 15 elements in 13 groups

Two extra-low dispersion glass elements help to minimize chromatic aberrations and maximize sharpness

Accepts 67mm threaded filters

Minimum focusing distance throughout the zoom range is 6.6

Super Protect coating on the front element helps keeps your lens scratch free and easy to clean

Internal focusing keeps the lens as compact as possible during use

Works with both film and digital formats

Aperture ring and focusing distance scale

Eight diaphragm blades for smooth out-of-focus areas