Pentax smc FA 645 45-85mm f/4.5 Lens


  • Pentax 645 Mount
  • 35.5-67mm (35mm Equivalent)
  • Aperture Range: f/4.5-32
  • Construction: 11 Elements / 9 Groups
  • Minimum Focus Distance: 1.6′
  • Fast AF/MF Switching
  • Eight Blade Diaphragm
  • Front Filter Thread: 77mm
  • Petal-Shaped Lens Hood

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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.

  • 35mm focal length equivalent of 35.5-67mm
  • Aperture range of f/4.5 to f/32
  • Angle of view of 76° to 44.5° which equates to 61.5° to 36° on Pentax 645 digital cameras
  • Lens construction of 11 elements in 9 groups
  • Accepts 77mm threaded filters
  • Minimum focusing distance throughout the zoom range is 1.6′
  • Works with both film and digital formats
  • Aperture ring and focusing distance scale
  • Eight diaphragm blades for smooth out-of-focus areas
Package Weight 3.0 lbs
Package Dimensions 9.685 x 7.244 x 4.882 in
Box Dimensions (LxWxH)

9.685 x 7.244 x 4.882″

Distance Scale



1.79 lb (815 g)

Angle of View @ Infinity

76° – 44.5°

Tripod Collar



Maximum: f/4.5 Minimum: f/32

Package Weight

3.0 lb




Approx. 3.35 x 3.92″ (85 x 99.5 mm)



Filter Thread

Front: 77 mm

Focal Length

45 – 85 mm



Diaphragm Blades


Camera Mount

Pentax 645

Minimum Focus Distance

1.64′ (.5 m)

Lens Type



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