smc D-FA 645 55mm F2.8


The SMC D-FA 645 55mm features not only new optics, optimized for high-quality digital photography to assure exceptional image detail performance while also providing an image circle suitable for existing PENTAX 645-format film cameras.

This fixed focal length standard lens also comes with a dependable, dust-proof, weather-resistant construction for active outdoor photography. With its 7 seals that prevents the intrusion of dust and water within the lens. By combining this objective with the PENTAX 645D body, the user is assured of a reliable and sustainable digital imaging, even when shooting outdoors in the rain or fog.

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State-of-the-art optics

Incorporating high-performance, hybrid aspherical optical element in its optics, this new standard lens offers exceptional image-resolving power with outstanding brightness levels even at the edges, while compensating various aberrations to a minimum. All lens characteristics are optimized for digital photography: for instance, flare and ghost images are minimized by applying exclusive lens coatings to optical elements and employing anti-reflection materials for the interior of the lens barrel. As the result, this lens can bring out the full potential of the PENTAX 645D medium-format digital SLR camera.

Versatile standard lens

When mounted on the PENTAX 645D camera body, this standard lens offers a focal length of 43.5mm (in the 35mm format), which produces an angle of view close to that of the human eye. As the result, it can be used for many different kinds of subjects and applications, including landscapes and portraits.

Dependable dustproof, weather-resistant construction

Using seven special seals, the lens’ dustproof, weather-resistant construction effectively prevents the intrusion of dust and water to the lens interior. By coupling this lens with the PENTAX 645D camera body, the user is assured of a durable, reliable digital SLR camera system that performs superbly in outdoor settings, even in rain or mist or at locations prone to water splashes or spray.
PENTAX plans to use the “AW” (All Weather) designation in the product name of all dustproof, weather-resistant medium-format interchangeable lenses to be marketed in the future.

Aero Bright coating to dramatically improve image description in backlight

The lens is treated with PENTAX-original Aero Bright coating, which delivers brilliant, high-quality images by preventing annoying flare and ghost images more effectively than ever before. Born as the fruit of PENTAX’s advanced nanotechnology, this exclusive coating effectively reduces lens reflectance and greatly increases light transmittance by forming a silica aerogel layer with uniform pores on the surface of optical element.

Rounded diaphragm to produce a beautiful bokeh

This is the first PENTAX medium-format interchangeable lens to features a completely rounded diaphragm. It creates a natural, beautiful “bokeh” (out-of-focus rendition), while minimizing the streaking effect of point light sources.

Smooth, quiet SDM autofocus mechanism

The SDM (Supersonic Direct-drive Motor) autofocus mechanism operates smoothly and quietly using the supersonic motor installed inside the lens barrel.

SP coating to block dust and dirt

The front surface of the lens is treated with PENTAX-original SP (Special Protect) coating, which applies an exclusive fluorine compound to the lens surface through a vapour deposition process. This SP coating not only effectively repels dust, water and grease, but also makes it easy to wipe off fingerprints and cosmetics.

Other features

1) Image circle covering the image area of 645-format film SLR cameras
2) Functional, simplified design, with no aperture ring
3) Quick-Shift Focus system for instant switching to manual-focus operation, after the subject is captured in focus by the AF system
4) PL filter window for easy installation of a polarizing filter without removing the lens hood
5) PH-SA67 Square Plastic Hood (optional) for more effective prevention of flare and ghost images when mounted on the PENTAX 645D camera body

PENTAX and smc PENTAX are trademarks of HOYA CORPORATION
SDM is a trademark of HOYA CORPORATION
Design and specifications are subject to change without notice

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.

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Product Specifications

Article Number26350
Focal length equivalent to 35 mm formatEquivalent to 43.5mm in 35mm format with 645D body
Equivalent to 34mm in 35mm format with Film 645 body
Maximum aperturef/2.8
Minimum aperturef/22
Number of Diaphragm Blades9
Fully Automatic diaphragm control
Angle of View53° (with 645D body)
65° (with Film 645 body)
Construction9 Elements in 7 groups
Focusing Range0.5m to infinity (1.65 ft. to infinity)
Smallest object distance/magnification
MagnificationMaximum 0.17x
Filter size67mm
Mount645 AF2
Weight416g (14.7 oz.)
Dimensions (Length x Diameter)81.3mm x 68.2mm (3.2 inch x 2.7 inch)
Kit ContentLens Hood PH-RBN 67mm
Lens case S100-120
Special metal front cover cap
Rear lens cap
FeaturesQuick-Shift Focus System
Aero Bright Coating
SP (Super Protect) coating
Dust proof, Water resistant (AW)
Optional Accessories
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