Pentax smc FA 645 55-110mm f/5.6 Lens


  • Pentax 645 Mount
  • 43.5-87mm (35mm Equivalent)
  • Aperture Range: f/5.6-45
  • Extra-Low Dispersion Glass Elements
  • Super Multi Coating
  • Construction: 9 Elements / 9 Groups
  • Minimum Focus Distance: 2.6′
  • Eight Blade Diaphragm
  • Front Filter Thread: 82mm

Special Order - Available in 2 to 4 weeks - Depending on availability from manufacturer

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The Pentax smc FA 645 55-110mm f/5.6 Lens is a standard zoom lens designed for Pentax 645 mount medium format cameras, both film and digital. It is designed for general shooting and has a standard to medium telephoto field of view with a 35mm equivalent focal length of 43.5-87mm. Also, it has a constant minimum aperture of f/5.6 and can stop down to f/45.

The lens design features 9 elements in 9 groups which feature a Super Multi Coating that prevents ghosting and flaring. For optimal image quality, the 55-110mm uses extra-low dispersion glass elements to prevent chromatic aberrations and maximize contrast and sharpness. Also, the lens will focus as close as 2.6′.

For smooth out-of-focus areas, the lens has an eight blade aperture diaphragm. There is also an 82mm front filter thread.

  • 35mm focal length equivalent of 43.5-87mm
  • Aperture range of f/5.6 to f/45
  • Angle of view of 53° to 28° which equates to 43° to 22.5° on Pentax 645 digital cameras
  • Lens construction of 9 elements in 9 groups
  • Super Multi Coating increases light transmission as well as helps to eliminate ghosting and flaring
  • Extra low-dispersion glass elements help to minimize chromatic aberrations and maximize sharpness
  • Minimum focusing distance is 2.6′
  • Accepts 82mm threaded filters
  • Works with both film and digital formats
  • Aperture ring and focusing distance scale
  • Eight diaphragm blades for smooth out-of-focus areas
Package Weight1.9 lbs
Package Dimensions6.378 x 5.276 x 4.961 in
Focal Length

55 – 110 mm

Filter Thread

Front: 82 mm



Minimum Focus Distance

2.62′ (.8 m)

Camera Mount

Pentax 645

Diaphragm Blades


Tripod Collar


Angle of View @ Infinity

53° – 28°

Box Dimensions (LxWxH)

6.378 x 5.276 x 4.961″

Distance Scale



1.10 lb (500 g)



Package Weight

1.9 lb


Approx. 3.46 x 4.09″ (88 x 104 mm)




Maximum: f/5.6 Minimum: f/45

Lens Type



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