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Pentax AF 300mm f/4.5 SMC-F ED IF

The Pentax AF 300mm f/4.5 ED IF is a 300mm f/4.5 lens designed for Pentax K mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Pentax AF 300mm f/4.5 SMC-F ED IF

Pentax AF 300mm f/4.5 SMC-F ED IF

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Lens Overview — Pentax AF 300mm f/4.5 ED IF

The Pentax AF 300mm f/4.5 SMC-F ED IF is a fixed focal length telephoto prime lens designed for Pentax K mount DSLR cameras. Built to cover full frame sensors, it delivers a dedicated 300mm reach that makes it a natural choice for photographers working with distant subjects in disciplines like wildlife, sports, and nature photography. The lens operates with a maximum aperture of f/4.5, providing a defined exposure baseline at its single focal length.

Both autofocus and manual focus modes are supported, giving shooters flexibility depending on the shooting situation. The 77mm filter thread is a common professional size, making it straightforward to pair with filters already in a photographer's kit. At 935 grams, the lens has a solid, substantial build that reflects its telephoto construction.

It is classified as a prime lens, meaning there is no zoom range — the 300mm focal length is fixed, which typically supports optical consistency across the frame. The lens carries no image stabilization, so photographers will need to account for that when shooting handheld or in lower light conditions. Mount compatibility is exclusively Pentax K, making it purpose-built for that camera system.

Key Features — Pentax AF 300mm f/4.5 ED IF

300mm Prime Focal Length: A fixed 300mm focal length delivers consistent telephoto reach, well-suited for wildlife, sports, and nature photography.

ED Glass Element: Extra-low Dispersion glass minimizes chromatic aberration, helping to produce sharper, more color-accurate images of distant subjects.

Internal Focus Design: IF construction means the lens does not change length during focusing, keeping balance steady and making it easier to use with filters.

Full Frame Coverage: Designed to cover a full frame sensor, so it works across the complete image circle on compatible Pentax K mount bodies.

f/4.5 Maximum Aperture: A maximum aperture of f/4.5 provides a defined exposure baseline and allows for moderate background separation at 300mm.

Auto & Manual Focus: Supports both autofocus and manual focus modes, giving photographers flexibility to switch based on subject or shooting conditions.

Lens Specifications — Pentax AF 300mm f/4.5 ED IF

Pentax AF 300mm f/4.5 ED IF full specifications
SpecDetail
Use CasesWildlife, Sports, Birding
Lens TypePrime
FormatFull Frame
Zoom/PrimePrime
Focal Length300mm
Maximum Aperturef/4.5
Camera SystemDSLR
Lens MountPentax K
AutofocusYes
Focus TypeAuto, Manual
Image StabilizationNone
Filter Thread77mm

Description — Pentax AF 300mm f/4.5 ED IF

The Pentax AF 300mm f/4.5 SMC-F ED IF is a 300mm fixed focal length telephoto prime built exclusively for the Pentax K mount system. Designed to cover full frame sensors, it delivers consistent telephoto performance at a maximum aperture of f/4.5. The lens supports both autofocus and manual focus, providing adaptability across different photographic situations and subject types.

A 77mm filter thread makes it easy to integrate with professional filter systems. Weighing in at 935 grams, this is a solid, purposeful telephoto prime. It carries no image stabilization, so steady technique or support equipment is recommended when shooting at this focal length.

As a prime lens, the 300mm focal length is fixed, reflecting a design philosophy focused on optical consistency at a single working distance. Compatible exclusively with Pentax K mount DSLR cameras.

Pros — Pentax AF 300mm f/4.5 ED IF

  • ✓Fixed 300mm focal length provides dedicated telephoto reach on Pentax K mount DSLR cameras
  • ✓Full frame coverage means it works across the complete sensor area on compatible Pentax bodies
  • ✓Supports both autofocus and manual focus, offering flexibility for different shooting scenarios

Cons — Pentax AF 300mm f/4.5 ED IF

  • ✗No image stabilization (specifications confirm 'None'), requiring careful technique or faster shutter speeds when shooting handheld
  • ✗Maximum aperture of f/4.5 is relatively modest for a 300mm telephoto, limiting light-gathering in challenging conditions
  • ✗Exclusive Pentax K mount compatibility restricts use to that specific camera system

Reviews — Pentax AF 300mm f/4.5 ED IF

Videos — Pentax AF 300mm f/4.5 ED IF

Is Bigger Better? - TAKUMAR 300MM F/4 REVIEW — Mark Holtze

Resources & Downloads — Pentax AF 300mm f/4.5 ED IF

Manuals & Guides

Frequently Asked Questions — Pentax AF 300mm f/4.5 ED IF

What camera mount does this lens use?+
This lens uses the Pentax K mount and is designed for Pentax DSLR cameras. It is not compatible with other camera systems without an adapter.
Does this lens cover full frame sensors?+
Yes, the lens format is specified as Full Frame, so it provides full coverage on full frame Pentax K mount bodies.
Does this lens have image stabilization?+
No. The specifications confirm that image stabilization is 'None.' Photographers shooting handheld at 300mm should be mindful of shutter speed to avoid camera shake.
What filter size does this lens accept?+
The lens has a 77mm filter thread, which is a common professional size that works with a wide range of third-party filters.
Is this a zoom or prime lens?+
This is a prime lens with a fixed focal length of 300mm. There is no zoom capability — the 300mm focal length is the sole working distance.
How heavy is this lens?+
The lens weighs 935 grams according to its specifications, making it a substantial piece of glass that may benefit from use with a tripod or monopod for extended sessions.

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