Pentax-D FA 645 55mm f/2.8 AL[IF] SDM AW Lens
The Pentax 55mm f/2.8 AL[IF] SDM AW is a 55mm f/2.8 lens designed for Pentax 645 mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
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Pentax-D FA 645 55mm f/2.8 AL[IF] SDM AW Lens
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Lens Overview — Pentax 55mm f/2.8 AL[IF] SDM AW
Key Features — Pentax 55mm f/2.8 AL[IF] SDM AW
55mm Medium Format Prime: On the Pentax 645 system, 55mm delivers a roughly 35mm-equivalent field of view, making it a versatile standard focal length for documentary, portrait, and general-purpose work.
f/2.8 Maximum Aperture: Provides strong light-gathering capability for a medium format prime, enabling handheld shooting in lower light and moderate background separation.
SDM Autofocus Motor: Supersonic Drive Motor delivers quiet, smooth autofocus operation well-suited to both still photography and situations where noise is a concern.
All-Weather Construction: AW (All Weather) sealing protects against dust and moisture, allowing use in outdoor and challenging shooting conditions.
Internal Focus Design: IF (Internal Focus) means the lens length does not change during focusing, keeping balance consistent and allowing use with polarizing filters without rotation issues.
Aspherical Lens Element: AL (Aspherical Lens) construction helps control spherical aberration and distortion for cleaner rendering across the frame.
Lens Specifications — Pentax 55mm f/2.8 AL[IF] SDM AW
| Spec | Detail |
|---|---|
| Use Cases | Studio, Travel |
| Lens Type | Prime |
| Format | Medium Format |
| Zoom/Prime | Prime |
| Focal Length | 55mm |
| Maximum Aperture | f/2.8 |
| Camera System | Medium Format |
| Lens Mount | Pentax 645 |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Filter Thread | 67mm |
Description — Pentax 55mm f/2.8 AL[IF] SDM AW
The Pentax-D FA 645 55mm f/2.8 AL[IF] SDM AW is a prime lens built natively for the Pentax 645 medium format system. With a focal length of 55mm and a maximum aperture of f/2.8, it sits in the standard focal length range and delivers consistent exposure performance across a variety of shooting conditions. The lens supports both autofocus and manual focus, making it adaptable to different workflows and subject types.
Weighing in at 416 grams, it is practical to carry and handle during extended shoots. The 67mm filter thread accommodates a broad range of commonly available filters, adding further versatility. Image stabilization is not present in this lens, so photographers should plan accordingly for low-light or slow-shutter work.
Designed exclusively for the Pentax 645 mount, it integrates seamlessly into the Pentax medium format ecosystem for a straightforward shooting experience.
Pros — Pentax 55mm f/2.8 AL[IF] SDM AW
- ✓Maximum aperture of f/2.8 provides strong light-gathering for a medium format prime
- ✓Supports both autofocus and manual focus, offering flexible shooting control
- ✓Native Pentax 645 mount ensures full system compatibility
Cons — Pentax 55mm f/2.8 AL[IF] SDM AW
- ✗No image stabilization, which may be a drawback in lower-light handheld situations
- ✗Exclusively compatible with Pentax 645 mount bodies, limiting flexibility across systems
- ✗f/2.8 maximum aperture, while solid, is not as fast as some competing standard primes in other formats
Reviews — Pentax 55mm f/2.8 AL[IF] SDM AW
Videos — Pentax 55mm f/2.8 AL[IF] SDM AW
Pentax 645D Hands-On Field Test — TheCameraStoreTV