Pentax DA* 300mm f/4 ED SDM Telephoto Lens
The Pentax 300mm f/4 ED SDM is a 300mm f/4 lens designed for Pentax K mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Pentax DA* 300mm f/4 ED SDM Telephoto Lens
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Lens Overview — Pentax 300mm f/4 ED SDM
Key Features — Pentax 300mm f/4 ED SDM
300mm f/4 Prime Telephoto: Fixed 300mm focal length with a maximum aperture of f/4 delivers consistent reach and light-gathering for wildlife, sports, and portraiture.
DA* Star-Series Build: Part of Pentax's premium DA* lens lineup, indicating higher optical quality standards and weather-resistant construction suited for field use.
ED Glass Element: Extra-low Dispersion glass minimizes chromatic aberration, producing sharper images with better color accuracy at long focal lengths.
SDM Ultrasonic Autofocus: Supersonic Drive Motor enables fast, quiet autofocus operation well-suited for tracking moving subjects like birds or athletes.
Auto and Manual Focus Modes: Easily switch between autofocus and manual focus, allowing precise focus override without removing your eye from the viewfinder.
APS-C Format Coverage: Optimized for APS-C sensors, delivering an effective focal length of approximately 450mm on Pentax DSLR bodies.
Lens Specifications — Pentax 300mm f/4 ED SDM
| Spec | Detail |
|---|---|
| Use Cases | Wildlife, Birding, Sports |
| Lens Type | Prime |
| Format | APS-C |
| Zoom/Prime | Prime |
| Focal Length | 300mm |
| Maximum Aperture | f/4 |
| Camera System | DSLR |
| Lens Mount | Pentax K |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Filter Thread | 77mm |
Description — Pentax 300mm f/4 ED SDM
The Pentax DA* 300mm f/4 ED SDM Telephoto Lens is a prime telephoto designed exclusively for the Pentax K mount and optimized for APS-C format DSLR cameras. With a fixed 300mm focal length and a maximum aperture of f/4, this lens delivers a consistent telephoto perspective well-suited to subjects at a distance. It supports both autofocus and manual focus, giving photographers the ability to switch modes based on their needs.
The 77mm filter thread aligns with professional-grade filter systems, and the lens weighs 1070g, making it a substantial but field-ready option for telephoto shooting. There is no image stabilization included, so steady technique or camera support becomes more important. As a dedicated Pentax K mount lens with APS-C coverage, it is purpose-built for Pentax DSLR users looking to extend their telephoto reach with a prime optic.
Pros — Pentax 300mm f/4 ED SDM
- ✓Fixed 300mm focal length with a maximum aperture of f/4 provides consistent telephoto reach
- ✓Supports both autofocus and manual focus modes for shooting flexibility
- ✓77mm filter thread is a widely used professional filter diameter, enabling easy filter compatibility
Cons — Pentax 300mm f/4 ED SDM
- ✗No image stabilization, which can be a limitation when shooting handheld or in lower light
- ✗APS-C-only lens format limits compatibility to crop sensor bodies within the Pentax K mount ecosystem
- ✗Fixed 300mm focal length offers no zoom flexibility, requiring physical repositioning to reframe
Videos — Pentax 300mm f/4 ED SDM
Pentax DA* 300mm F4 On Pentax K-1 and K-3 - What's The Difference For Wildlife Photography? — snappiness