Pentax FA 645 55-110mm f/5.6 Lens

Pentax FA 645 55-110mm f/5.6 Lens

Code: 26765    Brand: Pentax   

Designed for use with film and digital PENTAX 645 mount medium-format cameras, this standard zoom lens features a standard to medium telephoto view of 43.8mm to 87mm, for 35mm equivalent focal lengths, and a constant minimum aperture of f/5.6, which goes down to f/45. 

APN: 0027075054554
Supplier Code: 26765

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

This lens supports the range from the angle of view of the semi-standard lens to the medium telephoto focal length range suitable for portraits. The compact, lightweight design makes this lens also suitable for handheld shooting enabling you to enjoy large-screen digital photography everywhere from the studio to the field. This lens uses extra-low dispersion (ED) glass for correcting chromatic aberration and a ghostless coating for providing sharp images even under backlit conditions. It features reproducibility with clear, abundant color gradations and high contrast. A flower-shaped hood that is highly effective over the entire zoom range also has a PL filter operation window.

Lens Mount

PENTAX 645AF2 bayonet

Model No.


Focal Length

55-110mm (Equivalent to 43.5mm - 86.5mm in 35mm format)

Angle of View

53° - 28° - 645 Film 43° - 22.5° - 645Z, 645D

Lens Construction(group/elements)

9 elements in 9 groups

Min. Aperture (f)


Min. Focusing Distance


Max. Magnification


Filter Size


Diameter & Length (mm)

88mm x104mm

Weight (g)


Number of Diaphragm Blades


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