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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. Used copies start from $425.34 on GearFocus, with buyer protection on every purchase.

Pentax DA* 300mm f/4 ED SDM Telephoto Lens

Pentax DA* 300mm f/4 ED SDM Telephoto Lens

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Pentax DA* 300mm f4 SMC ED SDM IF Lens

Condition: Good

Product Highlights

  • 300mm Telephoto Lens
  • Weather-Sealed Design
  • SDM Autofocus Motor
  • Extra-Low Dispersion Glass

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Used Pentax 300mm f/4 ED SDM Listings on GearFocus

Pentax DA* 300mm f4 SMC ED SDM IF Lens
Pentax DA* 300mm f4 SMC ED SDM IF Lens

Good

$425.34

🚚 Free Shipping

Lens Overview — Pentax 300mm f/4 ED SDM

The Pentax DA* 300mm f/4 ED SDM Telephoto Lens is a prime telephoto lens built for Pentax K mount DSLR cameras, optimized for APS-C format sensors. With a fixed 300mm focal length and a maximum aperture of f/4, it offers a solid combination of reach and light-gathering capability for telephoto work across genres like wildlife, sports, and portraiture. The lens supports both autofocus and manual focus modes, giving photographers flexibility depending on the shooting situation.

Autofocus is available and can be toggled off in favor of manual control when precision or creative override is needed. The lens uses a 77mm filter thread, which is a common professional-grade filter diameter that aligns with other large-aperture telephoto lenses, making filter sharing practical for photographers already invested in that size. Weighing in at 1070g, it has a substantial but manageable build for a prime telephoto in this class.

There is no built-in image stabilization, so shooters should plan accordingly when working in lower light or at slower shutter speeds. Designed exclusively for the Pentax K mount ecosystem, it is a dedicated APS-C telephoto prime that complements Pentax DSLR systems well.

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

Pentax 300mm f/4 ED SDM full specifications
SpecDetail
Use CasesWildlife, Birding, Sports
Lens TypePrime
FormatAPS-C
Zoom/PrimePrime
Focal Length300mm
Maximum Aperturef/4
Camera SystemDSLR
Lens MountPentax K
AutofocusYes
Focus TypeAuto, Manual
Image StabilizationNone
Filter Thread77mm

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

Resources & Downloads — Pentax 300mm f/4 ED SDM

Manuals & Guides

Frequently Asked Questions — Pentax 300mm f/4 ED SDM

What camera mount does this lens use?+
This lens uses the Pentax K mount, making it compatible with Pentax K mount DSLR cameras. It is designed for APS-C format sensors.
Does this lens have image stabilization?+
No, the specifications indicate that image stabilization is listed as None. Photographers should account for this when shooting at slower shutter speeds or in low light.
Can I use autofocus and manual focus with this lens?+
Yes, the lens supports both autofocus and manual focus modes. The focus type is listed as both Auto and Manual in the specifications.
What filter size does this lens accept?+
This lens has a 77mm filter thread, which is a commonly used professional filter diameter.
Is this a zoom or a prime lens?+
This is a prime lens with a fixed focal length of 300mm. It does not zoom, so reframing requires physically moving the camera or changing position.
How heavy is this lens?+
The lens weighs 1070g according to the specifications. This is worth considering if you plan extended handheld shooting sessions.

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