Pentax's finest super-telephoto, A* 300mm f/4 with ED glass — the pinnacle of K-mount optical engineering.
The Pentax SMC Pentax-A* 300mm f/4 is a professional-grade super-telephoto prime from Pentax's premium A* (A-star) line, featuring ED glass and the finest optical quality in the K-mount system. The A* designation indicates Pentax's absolute highest tier of lens quality, reserved for their finest optical designs.
The ED glass controls chromatic aberration at 300mm where colour fringing becomes problematic, and the A-star optical design delivers exceptional sharpness and contrast. The f/4 aperture provides a good balance between speed and portability, enabling handheld use in good light conditions.
Build quality is premium Pentax with robust metal construction and smooth mechanical operation befitting the A* designation. The A-series mount provides auto exposure compatibility on appropriate Pentax bodies, and the lens handles well with the included tripod collar for stability.
The Pentax-A* 300mm f/4 is one of the most prized Pentax K-mount lenses on the used market. The A-star designation, ED glass, and professional optical quality make it the finest super-telephoto available natively for the Pentax K-mount film and digital system.