Pentax AF DA 645 25mm f/4 SMC AL IF SDM AW Lens
The Pentax AF DA 645 25mm f/4 is a 25mm f/4 lens designed for Pentax 645 mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Pentax AF DA 645 25mm f/4 SMC AL IF SDM AW Lens
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Lens Overview — Pentax AF DA 645 25mm f/4
Key Features — Pentax AF DA 645 25mm f/4
25mm Medium Format Prime: Fixed 25mm focal length delivers an ultra-wide field of view on the Pentax 645 system, equivalent to roughly 20mm in full-frame terms.
Pentax 645 Native Mount: Designed exclusively for the Pentax 645 medium format system, ensuring full electronic communication and native compatibility.
SDM Autofocus Motor: Built-in Supersonic Drive Motor enables quiet, fast autofocus operation directly in the lens barrel.
Auto/Manual Focus Switching: Supports both autofocus and manual focus operation, giving photographers flexibility across different shooting situations.
f/4 Maximum Aperture: Consistent f/4 aperture across a prime design with no zoom trade-off, suitable for landscape and architectural use in good light.
Internal Focus (IF): Focus is achieved internally so the lens barrel length does not change during focusing, keeping handling predictable and filters properly aligned.
Lens Specifications — Pentax AF DA 645 25mm f/4
| Spec | Detail |
|---|---|
| Use Cases | Landscape, Architecture, Real Estate |
| Lens Type | Wide-Angle |
| Format | Medium Format |
| Zoom/Prime | Prime |
| Focal Length | 25mm |
| Maximum Aperture | f/4 |
| Camera System | Medium Format |
| Lens Mount | Pentax 645 |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Filter Thread | 82mm |
Description — Pentax AF DA 645 25mm f/4
The Pentax AF DA 645 25mm f/4 is a prime wide-angle lens designed exclusively for the Pentax 645 medium format camera system. With a fixed 25mm focal length and a maximum aperture of f/4, it is built to serve photographers who need a dedicated wide-angle option within the Pentax 645 ecosystem. The lens supports both autofocus and manual focus, giving users flexibility across a range of shooting scenarios.
Fitted with an 82mm filter thread, it accommodates a wide variety of commonly available filters. Weighing 1,040g, the lens reflects the substantial build expected of medium format glass. It is mounted via the Pentax 645 lens mount, ensuring full native compatibility with cameras in that system.
No image stabilization is included, which is worth noting for handheld shooting in lower-light environments.
Pros — Pentax AF DA 645 25mm f/4
- ✓Dedicated Pentax 645 mount ensures native compatibility with the medium format system
- ✓25mm prime focal length delivers a wide field of view for medium format shooting
- ✓Supports both autofocus and manual focus modes for versatile operation
Cons — Pentax AF DA 645 25mm f/4
- ✗No image stabilization, which can be a limitation in handheld or low-light shooting scenarios
- ✗At 1,040g, the lens is heavy and may add significant fatigue during extended handheld use
- ✗Exclusive Pentax 645 mount means the lens is not usable outside this specific system
Reviews — Pentax AF DA 645 25mm f/4
Videos — Pentax AF DA 645 25mm f/4
Pentax 645D Hands-On Field Test — TheCameraStoreTV