Pentax smc FA 645 150-300mm f/5.6 ED IF Medium Format Lens
The Pentax 150-300mm f/5.6 ED IF is a 150–300mm f/5.6 lens designed for Pentax 645 mount cameras. Used copies start from $268.26 on GearFocus, with buyer protection on every purchase.
Pentax smc FA 645 150-300mm f/5.6 ED IF Medium Format Lens
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Lens Overview — Pentax 150-300mm f/5.6 ED IF
Key Features — Pentax 150-300mm f/5.6 ED IF
150-300mm Telephoto Zoom: Covers a useful telephoto range for portraits, wildlife, and events on the Pentax 645 medium format system.
Pentax 645 Native Mount: Designed exclusively for the Pentax 645 system, ensuring full native compatibility with Pentax 645 bodies.
Constant f/5.6 Aperture: Maximum aperture stays fixed at f/5.6 across the entire zoom range, keeping exposure consistent as you reframe.
Autofocus and Manual Focus: Supports both AF and MF operation, giving photographers flexibility across different shooting scenarios.
ED Glass Elements: Extra-low dispersion glass minimizes chromatic aberration, helping maintain sharpness and color accuracy at longer focal lengths.
Internal Focus Design: Focusing is handled internally, so the lens barrel does not extend or rotate during focus, aiding balance and filter use.
Lens Specifications — Pentax 150-300mm f/5.6 ED IF
| Spec | Detail |
|---|---|
| Use Cases | Wildlife, Birding, Travel |
| Lens Type | Telephoto |
| Format | Medium Format |
| Zoom/Prime | Zoom |
| Focal Length | 150–300mm |
| Maximum Aperture | f/5.6 |
| Camera System | Medium Format |
| Lens Mount | Pentax 645 |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Filter Thread | 67mm |
Description — Pentax 150-300mm f/5.6 ED IF
The Pentax smc FA 645 150-300mm f/5.6 is a telephoto zoom lens designed exclusively for the Pentax 645 medium format mount. Spanning a focal length range of 150mm to 300mm, it provides meaningful reach for a range of telephoto shooting applications on the Pentax 645 platform. The lens maintains a maximum aperture of f/5.6 throughout its zoom range, keeping exposure consistent as you adjust focal length.
Both autofocus and manual focus are supported, giving photographers the ability to adapt to different shooting scenarios without switching equipment. The 67mm filter thread makes it straightforward to add polarizing, ND, or UV filters from a widely available filter size. Weighing 920g, this lens is solidly built as expected for medium format telephoto glass, and should be used with appropriate support when shooting at longer focal lengths.
Note that image stabilization is not included, so attention to shutter speed or the use of a tripod is advisable, particularly at the 300mm end of the range.
Pros — Pentax 150-300mm f/5.6 ED IF
- ✓Covers a useful 150–300mm telephoto zoom range (minFocalLength: 150, maxFocalLength: 300) on the Pentax 645 system
- ✓Supports both autofocus and manual focus operation (focusType: Auto, Manual)
- ✓Consistent maximum aperture of f/5.6 across the entire zoom range (maximumAperture: 5.6)
Cons — Pentax 150-300mm f/5.6 ED IF
- ✗No image stabilization, which can be challenging when shooting handheld at 300mm (imageStabilization: None)
- ✗Maximum aperture of f/5.6 limits light-gathering ability in lower-light situations (maximumAperture: 5.6)
- ✗At 920g, the lens adds considerable weight to a medium format kit (weight: 920g)
Videos — Pentax 150-300mm f/5.6 ED IF
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Frequently Asked Questions — Pentax 150-300mm f/5.6 ED IF
What camera mount does this lens use?+
This lens is built for the Pentax 645 mount and is compatible with Pentax 645 medium format cameras. It will not natively fit other camera systems without an adapter.
Does this lens support autofocus?+
Yes, it supports both autofocus and manual focus operation. Shooters can switch between the two modes depending on their subject and shooting conditions.
What filter size does this lens accept?+
The lens has a 67mm filter thread, which accommodates a wide variety of commonly available screw-on filters including polarizers and neutral density filters.
Does this lens have image stabilization?+
No, image stabilization is not present in this lens. When shooting at longer focal lengths, using a tripod or faster shutter speeds is recommended to avoid camera shake.
How heavy is this lens?+
The lens weighs 920g. This is typical for a medium format telephoto zoom and should be factored into your kit planning, especially for extended handheld use.
Is the aperture constant throughout the zoom range?+
The lens has a maximum aperture of f/5.6. Based on the specifications provided, this is the stated maximum aperture for the lens across its 150–300mm focal length range.