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Covering a practical range from wide-angle to short telephoto, the Pentax smc FA 645 45-85mm f/4.5 is a versatile standard zoom designed for the 645 system. It delivers a 35mm-equivalent focal length of approximately 35.5-67mm, making it well-suited for landscapes, environmental portraits, and general-purpose shooting. The constant f/4.5 maximum aperture maintains consistent exposure throughout the zoom range and can be stopped down to f/32 for greater depth of field control.
The optical design consists of 11 elements in 9 groups, balancing image quality with a manageable size. A convenient push-pull focus ring allows quick switching between autofocus and manual focus, while a close minimum focusing distance of 1.6′ enables tighter compositions. An eight-blade diaphragm helps produce smooth, pleasing out-of-focus areas for more natural background rendering.
35mm-equivalent focal length range of 35.5-67mm for flexible wide-to-short telephoto coverage.
Constant f/4.5 aperture ensures consistent exposure across the zoom range, with a minimum aperture of f/32.
11 elements in 9 groups support solid optical performance and image clarity.
Push-pull focus ring allows quick switching between autofocus and manual focus.
Minimum focusing distance of 1.6′ enables close-up shooting.
Eight-blade diaphragm contributes to smooth, attractive bokeh.
77mm front filter thread supports a wide range of filters.
Aperture ring and distance scale provide traditional manual control and easy reference.
Compatible with both Pentax 645 film and digital camera systems.
