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Pentax 645 DA 25mm F/4 AL IF SDM AW Lens
Weatherproof - Seals protect from dust, humidity and light splashing.
Fixed focal-length. No zoom.
Rectilinear are normal lenses that show straight lines as straight lines.
No thread to mount front filters.
Quick-Shift Autofocus, also called Direct Manual-Focus (DMF).
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.
Focal-Range
Angle-Of-View
Maximum Aperture
Viewing Angle Range
Maximum Aperture
Magnification
Weight
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 Aperture | F/4 | Min Aperture | F/32 |
| Min Focus | 40cm | Magnification | 0.11X |
| Filter Size | Aperture Blades | 9 | |
| Size (D x L) | 90 x 149mm | Weight | 1040g |
| Tilt | N / A | Shift | N / A |
| Stabilization | Protection | Weatherproof | |
| Zoom Drive | N / A | Focus Drive | AF with Quick-Shift |
| Zoom Mechanism | N / A | Focus Mechanism | Internal |
| Hood | Fixed | Focus Motor | Super Sonic |
| Perspective | Rectilinear | Introduced | 2012-03-22 |
| Features | Internal rotating circular polarizing insert. 40.5mm inner filter-tray. | ||
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Pentax 25mm F/4 Facts
Weatherproof - Seals protect from dust, humidity and light splashing.Fixed focal-length. No zoom.Rectilinear are normal lenses that show straight lines as straight lines.No thread to mount front filters.Quick-Shift Autofocus, also called Direct Manual-Focus (DMF).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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