The Pentax smc FA 645 45-85mm f/4.5 Lens is a standard zoom lens capable of wide angle to short telephoto focal lengths equivalent to 35.5-67mm in 35mm format. The maximum f/4.5 aperture is constant throughout the zoom range, and it can stop down to a minimum of f/32. This is due in part to a lens construction of 11 elements in 9 groups.
During use, you can switch between auto and manual focus by simply sliding the focus ring forward or backward. It can even focus down to a minimum of 1.6' away. Further benefiting image quality is an eight blade diaphragm that will ensure smooth out-of-focus areas. It also comes with a case and has a 77mm front filter thread.
Focal Length | 45 to 85mm |
Maximum Aperture | f/4.5 |
Minimum Aperture | f/32 |
Lens Mount | Pentax 645 |
Angle of View | 44.5° to 76° |
Minimum Focus Distance | 1.64' / 0.5 m |
Maximum Magnification | 0.22x |
Optical Design | 11 Elements in 9 Groups |
Diaphragm Blades | 8 |
Focus Type | Autofocus |
Image Stabilization | No |
Filter Size | 77 mm (Front) |
Dimensions (ø x L) | 3.35 x 3.92" / 85 x 99.5 mm |
Weight | 1.79 lb / 815 g |
Package Weight | 3 lb |
Box Dimensions (LxWxH) | 9.685 x 7.244 x 4.882" |