Pentax smc FA 645 45-85mm f/4.5 Zoom Lens
The Pentax 45-85mm f/4.5 is a 45–85mm f/4.5 lens designed for Pentax 645 mount cameras. Used copies start from $247.18 on GearFocus, with buyer protection on every purchase.
Pentax smc FA 645 45-85mm f/4.5 Zoom Lens
Used Pentax 45-85mm f/4.5 Listings on GearFocus
Lens Overview — Pentax 45-85mm f/4.5
Key Features — Pentax 45-85mm f/4.5
45-85mm Standard Zoom: Covers a versatile focal length range suited to portraits, environmental work, and general-purpose medium format shooting.
Pentax 645 Mount: Designed exclusively for the Pentax 645 medium format system, compatible with both film and digital 645 bodies.
Autofocus and Manual Focus: Supports AF operation for speed-driven shooting as well as manual focus for deliberate, hands-on control.
Constant f/4.5 Aperture: Maintains the same maximum aperture throughout the zoom range, ensuring consistent exposure without compensation when reframing.
smc Lens Coating: Pentax's Super Multi-Coating reduces flare and ghosting, helping maintain contrast and color fidelity in varied lighting conditions.
77mm Filter Thread: Accepts widely available 77mm filters for polarizers, ND filters, or lens protection without the need for step-up rings.
Lens Specifications — Pentax 45-85mm f/4.5
| Spec | Detail |
|---|---|
| Use Cases | Studio |
| Lens Type | Zoom |
| Format | Medium Format |
| Zoom/Prime | Zoom |
| Focal Length | 45–85mm |
| Maximum Aperture | f/4.5 |
| Camera System | Medium Format |
| Lens Mount | Pentax 645 |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Filter Thread | 77mm |
Description — Pentax 45-85mm f/4.5
The Pentax smc FA 645 45-85mm f/4.5 is a standard zoom lens designed specifically for the Pentax 645 medium format system. With a focal length range spanning 45mm to 85mm, it covers the everyday zoom territory that suits a broad range of photographic subjects. The lens operates at a maximum aperture of f/4.5, which remains consistent across its zoom range, ensuring predictable exposure settings whether you're at the wide or telephoto end.
Both autofocus and manual focus modes are supported, giving users the ability to adapt their focusing approach to suit different shooting conditions. Mounted via the Pentax 645 lens mount, it integrates directly with compatible medium format bodies in that system. A 77mm filter thread provides compatibility with a wide selection of standard filters.
The lens weighs 880g and has no image stabilization. It is classified as a medium format, standard zoom lens.
Pros — Pentax 45-85mm f/4.5
- ✓Covers a practical 45–85mm standard zoom range well-suited to a variety of shooting situations
- ✓Supports both autofocus and manual focus, offering workflow flexibility
- ✓Consistent maximum aperture of f/4.5 maintained across the full zoom range
Cons — Pentax 45-85mm f/4.5
- ✗Maximum aperture of f/4.5 is relatively modest, limiting performance in lower light conditions
- ✗No image stabilization, as confirmed in specifications
- ✗At 880g, the lens adds considerable weight to a medium format kit
Videos — Pentax 45-85mm f/4.5
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