Pentax 645 FA 400mm F/5.6 Lens

Fixed focal-length. No zoom.Fixed focal-length. No zoom.Rectilinear are normal lenses that show straight lines as straight lines.Rectilinear are normal lenses that show straight lines as straight lines.Thread size in milimeters for screw-on filters.Thread size in milimeters for screw-on filters.77Autofocus LensAutofocus Lens

Lens Description

The Pentax 645 FA 400mm F/5.6 is a medium telephoto prime designed for cameras with a 645 (0.5X) sensor. This prime has a 400mm focal-length. It provides the same field of view as a 200mm lens on a Full-Frame camera.

This prime can focus down to 300cm from the imaging plane which gives it a maximum magnification of 0.14X. The lens supports autofocus and features a switch to disengage AF for focusing manually. While this lens is capable of AF, it does not have a built-in focus motor. It can only focus with a compatible camera body which features a mechanical AF-coupling.

This lens is only available for Pentax 645. Follow this link for all current compatible digital cameras: Pentax 645 mount cameras with 645 (0.5X) or smaller sensors.

Pentax 645 FA 400mm F/5.6

Pentax 645 FA 400mm F/5.6 Specifications

Brand Pentax Model 645 FA 400mm F/5.6
Mount Pentax 645 AF2 Max FLM 0.5X
Focal Length 400mm View Angle 10°
Max ApertureF/5.6Min ApertureF/45
Min Focus300cmMagnification0.14X
Filter Size77mm Aperture Blades8
Size (D x L)83 x 252mm Weight1260g
TiltN / A ShiftN / A
Stabilization ProtectionNone
Zoom Drive Mechanic Focus Drive AF with MF Switch
Zoom Mechanism N / A Focus Mechanism Internal
Hood Bayonet Focus Motor External
Perspective RectilinearIntroduced2010-03-10

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Pentax 400mm F/5.6 Facts


Fixed focal-length. No zoom.Fixed focal-length. No zoom.Rectilinear are normal lenses that show straight lines as straight lines.Rectilinear are normal lenses that show straight lines as straight lines.Thread size in milimeters for screw-on filters.Thread size in milimeters for screw-on filters.77Autofocus LensAutofocus Lens
400mm Focal-Length F/5.6 Constant Aperture
77mm Filter Thread AF with MF Switch
Pentax 645 Mount 0.5 Max Crop-Factor
1260g Lens Weight 83 x 252mm (D x L)
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