Pentax 300mm f/4 SMC Lens
The Pentax 300mm f/4 is a 300mm f/4 lens designed for Pentax K mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Pentax 300mm f/4 SMC Lens
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Lens Overview — Pentax 300mm f/4
Key Features — Pentax 300mm f/4
300mm Prime Focal Length: Fixed telephoto perspective with no zoom trade-offs, well-suited to wildlife, sports, and distant subjects.
f/4 Maximum Aperture: Provides a reasonably bright viewfinder image and meaningful subject separation at telephoto distances.
Pentax K Mount: Designed for the Pentax K mount system, compatible with both film and digital Pentax K mount bodies.
Full-Frame Coverage: Covers a full-frame image circle and can also be used on APS-C Pentax K mount bodies without vignetting.
Manual Focus Operation: Entirely manual focus design suits deliberate shooters who prefer direct control over focus placement.
SMC Optical Coating: Super Multi-Coated glass helps reduce flare and ghosting for improved contrast in backlit or high-contrast situations.
Lens Specifications — Pentax 300mm f/4
| Spec | Detail |
|---|---|
| Use Cases | Wildlife, Sports, Birding |
| Lens Type | Prime |
| Format | Full Frame |
| Zoom/Prime | Prime |
| Focal Length | 300mm |
| Maximum Aperture | f/4 |
| Camera System | DSLR |
| Lens Mount | Pentax K |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 77mm |
Description — Pentax 300mm f/4
The Pentax 300mm f/4 SMC is a 300mm telephoto prime lens designed for the Pentax K mount, offering full-frame coverage suitable for Pentax K mount DSLRs. With a maximum aperture of f/4, it delivers a bright enough image at telephoto distances for a range of subjects including nature, sports, and distant portraiture. Focus is entirely manual, appealing to photographers who prefer hands-on control and deliberate shooting.
The lens weighs 925g, making it a solid but portable option in the 300mm telephoto prime category. A 77mm filter thread allows straightforward use of common professional filters. There is no image stabilization, so technique and support equipment become important considerations when shooting handheld.
As a prime lens, the fixed focal length keeps the optical path simple and consistent. This lens is a focused, no-frills option for Pentax K mount shooters who want a dedicated 300mm manual focus telephoto.
Pros — Pentax 300mm f/4
- ✓Fixed 300mm focal length provides a dedicated telephoto prime with no zoom compromise
- ✓Full-frame coverage on Pentax K mount bodies, usable on APS-C as well
- ✓Maximum aperture of f/4 offers a reasonably bright image at 300mm
Cons — Pentax 300mm f/4
- ✗Manual focus only — no autofocus support, which limits use in fast-moving or action scenarios
- ✗No image stabilization, making handheld shooting at 300mm more challenging
- ✗Pentax K mount compatibility limits use to Pentax K system bodies without an adapter
Reviews — Pentax 300mm f/4
Videos — Pentax 300mm f/4
Is Bigger Better? - TAKUMAR 300MM F/4 REVIEW — Mark Holtze