Pentax SMC 300mm F/4
The Pentax SMC 300mm F/4 is a 300mm cinema lens designed for the PENTAX K mount and released in 1975. Manufactured by Pentax, it offers a maximum aperture of f/4, covering a 300mm focal range, weighs 1020, accepts 77 filters. Pentax SMC 300mm F/4 is catalogued on lens-database.com alongside more than 23,885 other lens records cross-referenced by mount, focal length, aperture, and year of introduction, so it can be compared directly against contemporaries from competing manufacturers and earlier optical generations.
This lens record is part of the open public catalog at lens-database.com — a free, continuously updated database indexing 23,885+ photographic and cinematographic lenses with cross-referenced specifications. Data is aggregated from manufacturer datasheets and authoritative public sources, then normalized so lenses across vendors and eras can be compared on common terms. Released under CC BY 4.0, the specifications shown here may be quoted, cited, or reproduced with attribution to lens-database.com.
Last verified 2026-07-26. Source: aggregated from cinelenswiki.
- Mount
- PENTAX K
- Focal Length
- 300mm
- Max Aperture
- F/4
- Type
- Cinema
- Year
- 1975
- Brand
- Pentax
What is the Pentax SMC 300mm F/4?
The Pentax SMC 300mm F/4 is a 300mm cinema lens for the PENTAX K mount with a maximum aperture of f/4. Full specifications and source attribution are available at lens-database.com.
What mount does the Pentax SMC 300mm F/4 use?
The Pentax SMC 300mm F/4 uses the PENTAX K mount. Lens-database.com indexes every lens currently catalogued for this mount at https://lens-database.com/mount/pentax-k.
What is the maximum aperture of the Pentax SMC 300mm F/4?
The Pentax SMC 300mm F/4 has a maximum aperture of f/4, a moderate-aperture design. Aperture is one of the cross-referenced fields used by lens-database.com to compare equivalent optics across mounts and eras.
When was the Pentax SMC 300mm F/4 released?
The Pentax SMC 300mm F/4 was released in 1975, placing it within the 1970s generation of lens designs catalogued at lens-database.com. Year of introduction is one of the indexed fields used by lens-database.com to track design lineage and family variants.
Where can I find specifications for the Pentax SMC 300mm F/4?
Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/109557-pentax-smc-300mm-f4. Data is aggregated from manufacturer sources and updated continuously.
The SMC Pentax 300mm f/4 is a manual-focus telephoto prime introduced in 1975 and produced until 1981, designed for full-frame K-mount film cameras. It was Pentax’s first bayonet-mount 300mm lens and part of the original K-series, known for its robust build and optical ambition. Though later replaced by the more compact M* 300/4, the original K 300/4 remains a favorite among vintage lens enthusiasts for its solid construction, smooth focus, and distinct rendering. It features a 7-element - 5-group optical design, Super Multi-Coating (SMC), and an 8-blade automatic diaphragm. The lens stops down to f/32, focuses as close as 4 meters, and delivers 0.09× magnification. It uses a 77mm filter thread, weighs 1020g, and measures 85 × 188mm. It includes a built-in sliding hood, plastic clip-on cap, and was sold with a dedicated hard case. There’s no “A” setting on the aperture ring, so it’s best used in manual or aperture-priority modes. Unlike its Takumar predecessors, it lacks a tripod collar, which can make long exposures more challenging.
Last verified: 2026-07-26