HD PENTAX-D FA 645 35mm F3.5 AL [IF]


The lens design is based on the smc PENTAX-FA645 35mm F3.5AL[IF], renowned for its crisp image description. Thanks to the incorporation of a newly designed high-grade aspherical optical elements, it has been optimized for digital imaging by minimizing various aberrations. It is also treated with the PENTAX-original HD Coating to deliver high-contrast, high-resolution images even under demanding lighting conditions such as backlight, making it ideal for scenic photography.

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Optical design supporting super-high-resolution images of medium-format digital SLR cameras

Combining a newly designed, high-grade glass-molded aspherical element with a high refractive index low dispersion glass element and a hybrid aspherical element in its optics, this lens effectively compensates for chromatic and spherical aberrations and assures a sufficient peripheral brightness level, while enhancing image resolution and crisp image description at edges of the image field. The lens coating and reflective material used for the interior of the lens barrel are optimized for the distinctive characteristics of digital imaging. This allows it to draw out the optimum performance of PENTAX medium-format digital SLR cameras, while minimizing flare and ghost images.

Wide-angle perspective perfect for scenic photography

This lens provides a focal length of 27.5mm (in the 35mm format; when mounted on a 645Z or 645D camera body) to capture wide-angle images of landscape and architecture. With a minimum focusing distance of 0.3 meters and a maximum magnification of 0.25 times, it can also be used for close-up photography, allowing the photographer to capture subjects such as flowers from a close distance, while retaining the scenery in the background to emphasize the sense of depth. What's more, its inner-focus mechanism keeps its total length unchanged during focusing, and allows the user to maintain the ideal balance during handheld shooting.

HD Coating for high-resolution images

This lens is treated with the PENTAX-original, high-grade HD Coating.* Compared with conventional multi-layer coatings, this innovative coating assures higher light transmittance and lower reflection to deliver bright, high-contrast images free of flare and ghost images, even under demanding lighting conditions such as backlight.

Rounded diaphragm for a beautiful bokeh effect

This lens features a nine-blade, rounded diaphragm to produce a smooth, beautiful bokeh (defocus) effect, while minimizing the streaking effect of point light sources.

Other features

  • Image circle covering the entire image size of 645-series film-format SLR cameras
  • SP (Super Protect) Coating applied to the front surface of the lens to effectively repel water and grease
  • Attachment of various filters, such as a C-PL (circular polarizing) filter, to the front end of the lens
  • PL filter window for easy control of a polarizing filter without requiring the removal of the lens hood

Further Information

In order to discover the products which are being developped and the ones which are planned, you can download our roadmap in pdf:

To see our K-mount currently available range, please download Lenses & Accessories brochure.

Visit the PENTAX Lens Technology web page to discover more about the PENTAX lens construction.

Read more about the PENTAX Focus Function here.

You can use the PENTAX Lens Glossary to learn more about its features.

Product Specifications

Article Number26450
Focal length equivalent to 35 mm format

27.5mm (with 645D/Z body)

21.5mm (with film 645 body)

Maximum apertureF3.5
Minimum apertureF32
Number of Diaphragm Blades


Rounded aperture (F3.5-7.1)

Diaphragm control: Fully Automatic

Angle of View

76° (with 645D/Z body)

90° (with film 645 body)


10 elements in 7 groups

Focusing Range

0,3 m bis unendlich

Smallest object distance/magnification




Filter size





Approx. 570g (with hood Approx. 610g)

Dimensions (Length x Diameter)

Approx. 88mm x 90mm

Kit Content

Case, Hood, Lens cap, Lens Mount cap

Optional AccessoriesLens Hood PH-RBE82
Lens Cap O-LC82
Lens Case S120-150
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