Pentax 645 DA 25mm F/4 AL IF SDM AW Lens

Weatherproof - Seals protect from dust, humidity and light splashing.Weatherproof - Seals protect from dust, humidity and light splashing.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.No thread to mount front filters.No thread to mount front filters.Quick-Shift Autofocus, also called Direct Manual-Focus (DMF).Quick-Shift Autofocus, also called Direct Manual-Focus (DMF).Discontinued: No longer produced by the manufacturer. May still be in stock or found used.Discontinued: No longer produced by the manufacturer. May still be in stock or found used.

Lens Description

The Pentax 645 DA 25mm F/4 AL IF SDM AW is an ultra-wide prime designed for cameras with a 645D (0.8X) sensor. This prime has a 25mm focal-length. It provides the same field of view as a 20mm lens on a Full-Frame camera.

This prime lens focuses down to 40cm from the imaging plane, capturing subject with a maximum 0.11X magnification. The lens offers a Quick-Shift AF system which lets the user simply rotate the focus-ring to focus manually. A Super-Sonic motor inside the lens delivers very fast and relatively quiet AF.

The lens weighs 1.04kg. Its body is weatherproof against adverse weather such as rain and snow. Seals in key areas prevent entry of water and dust.

This lens is only available for the Pentax 645 mount. It directly attaches and is fully compatible with all Pentax 645 mount cameras with 645D (0.8X) sensors.

Pentax 645 DA 25mm F/4 AL IF SDM AW
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Pentax 645 DA 25mm F/4 AL IF SDM AW

Focal-Range

25mm90mm
25mm
FOCAL-RANGE OF WEATHERPROOF Pentax 645 MOUNT LENSES WITH AT LEAST 645D (0.8X) COVERAGE

Angle-Of-View

42.5°95°
95°
ANGLE OF VIEW OF WEATHERPROOF Pentax 645 MOUNT RECTILINEAR LENSES WITH 645D (0.8X)+ COVERAGE

Maximum Aperture

2.84.5
4
MAXIMUM APERTURE OF WEATHERPROOF Pentax 645 MOUNT LENSES WITH AT LEAST 645D (0.8X) COVERAGE

Viewing Angle Range

Pentax 25mm F/4

Maximum Aperture

Compared to other Pentax 645 645D (0.8X) lenses.
95°
Max F/4

Magnification

0.11X1X
0.11X
MAGNIFICATION OF Pentax 645 MOUNT LENSES WITH AT LEAST 645D (0.8X) COVERAGE

Weight

416g1470g
1040g
WEIGHT OF WEATHERPROOF Pentax 645 MOUNT LENSES WITH AT LEAST 645D (0.8X) COVERAGE

Pentax 645 DA 25mm F/4 AL IF SDM AW Specifications

Brand Pentax Model 645 DA 25mm F/4 AL IF SDM AW
Mount Pentax 645 Max FLM 0.8X
Focal Length 25mm View Angle 95°
Max ApertureF/4Min ApertureF/32
Min Focus40cmMagnification0.11X
Filter Size Aperture Blades9
Size (D x L)90 x 149mm Weight1040g
TiltN / A ShiftN / A
Stabilization ProtectionWeatherproof
Zoom Drive N / A Focus Drive AF with Quick-Shift
Zoom Mechanism N / A Focus Mechanism Internal
Hood Fixed Focus Motor Super Sonic
Perspective RectilinearIntroduced2012-03-22
Features

Internal rotating circular polarizing insert. 40.5mm inner filter-tray.

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Pentax 25mm F/4 Facts

Pentax 645 DA 25mm F/4 AL IF SDM AW
Weatherproof - Seals protect from dust, humidity and light splashing.Weatherproof - Seals protect from dust, humidity and light splashing.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.No thread to mount front filters.No thread to mount front filters.Quick-Shift Autofocus, also called Direct Manual-Focus (DMF).Quick-Shift Autofocus, also called Direct Manual-Focus (DMF).Discontinued: No longer produced by the manufacturer. May still be in stock or found used.Discontinued: No longer produced by the manufacturer. May still be in stock or found used.
25mm Focal-Length F/4 Constant Aperture
No filter thread AF with Quick-Shift
Pentax 645 Mount 645D (0.8X) Coverage
1040g Lens Weight 90 x 149mm (D x L)
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