Mamiya's fast wide-angle for the AF 645 — the 45mm f/2.8 covering a 28mm equivalent on 645 digital.
The Mamiya AF 45mm f/2.8 is a wide-angle prime for the Mamiya 645AF medium format system, providing approximately a 28mm equivalent field of view on the 645 format. One of the few autofocus wide-angle lenses in the medium format space, it offered the convenience of AF focusing in a professional medium format package for studio and location work.
Optical performance is good. Sharpness is very good when stopped down with the resolution advantage of the 645 format. The f/2.8 aperture is reasonably fast for a medium format wide-angle. Distortion is well-controlled for the focal length. The 28mm equivalent perspective is useful for architecture, environmental portraits, and landscape on medium format.
Mamiya 645AF mount with autofocus. Filter thread is 67mm. Weight is approximately 440 grams — moderate for medium format. Build quality is professional grade. The 645AF system was Mamiya's transition to autofocus medium format, later evolved into the Phase One/Mamiya Leaf digital system. The lens provides genuine AF convenience.
Available on the used market at moderate prices. Check AF motor operation and clean optics. An interesting autofocus wide-angle for the 645AF system. The 28mm equivalent on medium format provides a perspective with resolution and tonal quality that 35mm-based systems cannot match. Useful for architectural and commercial work.