Pentax SMC 17mm F/4 Fish-Eye
The Pentax SMC 17mm F/4 Fish-Eye is a 17mm fisheye lens designed for the PENTAX K mount and released in 1975. Manufactured by Pentax, it offers a maximum aperture of f/4, covering a 17mm focal range, weighs 234. Pentax SMC 17mm F/4 Fish-Eye 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 2026-07-27. Source: aggregated from cinelenswiki.
- Mount
- PENTAX K
- Focal Length
- 17mm
- Max Aperture
- F/4
- Type
- Fisheye
- Year
- 1975
- Brand
- Pentax
What is the Pentax SMC 17mm F/4 Fish-Eye?
The Pentax SMC 17mm F/4 Fish-Eye is a 17mm fisheye 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 17mm F/4 Fish-Eye use?
The Pentax SMC 17mm F/4 Fish-Eye 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 17mm F/4 Fish-Eye?
The Pentax SMC 17mm F/4 Fish-Eye 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 17mm F/4 Fish-Eye released?
The Pentax SMC 17mm F/4 Fish-Eye 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 17mm F/4 Fish-Eye?
Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/98590-pentax-smc-17mm-f4-fish-eye. Data is aggregated from manufacturer sources and updated continuously.
The SMC Pentax 17mm f/4 Fish-Eye is a compact, manual-focus ultra-wide lens introduced in 1975 and produced until 1985, designed for full-frame K-mount film cameras. It delivers a 180° diagonal field of view while filling the frame rather than producing a circular image. With an 11-element/7-group optical design, Super Multi-Coating (SMC), and a 6-blade automatic diaphragm, it was Pentax’s only K-series diagonal fisheye prime, later succeeded by the A 16mm F2.8. The lens has no front filter thread due to its bulbous front element, but includes a built-in rotating turret with four internal filters: Skylight, UV, Yellow, and Orange—a feature especially useful for black-and-white film photography. It also accepts rear-mounted gelatin filters. The minimum focus distance is 20cm, offering 0.1× magnification, and the lens weighs just 234g, measuring 64.5 × 34mm—remarkably small for a full-frame fisheye.
Last verified: 2026-07-27