Pentax FA 33-55mm f/4.5 AL Lens for 645D & 645Z

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Product Overview

  • Pentax 645 Mount

  • 26-43.5mm (35mm Equivalent)

  • Aperture Range: f/4.5-32

  • Two Aspherical Elements

  • Low-Dispersion Glass Elements

  • Construction: 11 Elements / 8 Groups

  • Minimum Focus Distance: 40 cm

  • Eight Blade Diaphragm

  • Front Filter Thread: 82mm

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The Pentax smc FA 645 33-55mm f/4.5 AL Lens is a wide-angle zoom lens designed for use with medium format Pentax 645 mount cameras. It features an aperture range of f/4.5-32 and has a 35mm equivalent focal length of 26-43.5mm, providing a very useful range of wide-angle lengths. This lens in particular utilizes two aspherical elements that greatly reduce distortion, field curvature, and coma aberrations common with wide angle lenses.

The 33-55mm features a lens construction of 11 elements in 8 groups, including some high refraction low-dispersion glass. To maintain image quality, it uses a 3-group floating zoom to reduce field curvature throughout the range. Also, the 33-55mm has a minimum focus distance of 15.7".

For smooth out-of-focus areas, the lens has an eight blade aperture diaphragm. Additionally, it features an 82mm front filter thread.

  • 35mm focal length equivalent of 26-43.5mm
  • Aperture range of f/4.5 to f/32
  • Angle of view of 80° to 53° which equates to 65° to 43° on Pentax 645 digital cameras
  • Lens construction of 11 elements in 8 groups
  • Low-dispersion glass elements help to minimize chromatic aberrations and maximize sharpness
  • Accepts 82mm threaded filters
  • Minimum focusing distance throughout the zoom range is 40 cm
  • Super Multi Coating increases light transmission as well as helps to eliminate ghosting and flaring
  • Works with both film and digital formats
  • Aperture ring and focusing distance scale
  • Eight diaphragm blades for smooth out-of-focus areas


  • MPN - 26775
  • GTIN - 027075063228
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Focal Length33 - 55 mm
Focal Length33 - 55 mm
Aperture RangeMaximum: f/4.5
Minimum: f/32
ApertureMaximum: f/4.5
Minimum: f/32
Camera MountPentax 645
Camera Mount TypePentax 645
Angle of Coverage80 - 53
Minimum Focus Distance40 cm
Minimum Focusing Distance15.75“ (40 cm)
Diaphragm Blades8
Angle Of View80 - 53 @ Infinity
Distance scaleYes
Groups 8
Diaphragm Blades8
Tripod CollarNo
Filter SizeFront: 82 mm
Filter ThreadFront: 82 mm
Tripod CollarNo
Dimensions88 x 104 mm
Dimensions (DxL)Approx. 3.46 x 4.09“ (88 x 104 mm)
Image Stabilization11 Elements in 8 Groups
Distance ScaleYes
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What’s In The Box

Pentax smc FA 645 33-55mm f/4.5 AL Lens

  • Front Lens Cap

  • Lens Hood

  • Limited 1-Year Warranty

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