| smc PENTAX-F FISH-EYE ZOOM 17mm–28mm F3.5-4.5 | |
| Maker: | Pentax |
| Feat-Is: | n |
| Focusdrive: | screw |
| Feat-Macro: | n |
| Feat-Special: | Fisheye |
| Type: | z |
| Application: | Special Effect |
| Flength: | 17–28mm |
| Fov: | 1 |
| Aperture: | 3.5-4.5 |
| Groups: | 7 |
| Elements: | 9 |
| Close-Dist: | 0.45m (01.48feet)[1] |
| Max-Mag: | 0.07 |
| Weight: | 255g |
| Max-Diameter: | 65mm |
| Max-Length: | 61mm |
| Filter: | N/A |
| Hood: | built-in |
| Av-Diag: | 180°–90° |
The smc Pentax-F 17–28mm Fish-eye 3.5–4.5 is the first fisheye zoom lens, manufactured by Pentax for single-lens reflex cameras (SLRs) with a K lens mount. At its widest setting of 17mm, it affords a 180° diagonal angle of view images for all K-mount full-frame SLR cameras; at 28mm, the diagonal angle of view is reduced to 90° on the diagonal. Typical fisheye barrel distortion is evident at all focal lengths. A successor model, the Pentax DA 10-17mm lens, was introduced with the same view angles and closer focusing capability for APS-C cameras in 2006.
The lens was designed by Jun Hirakawa and a patent was applied for the design in 1994, granted in 1998.[2]
Longtime photography writer Herbert Keppler was a noted fan of the lens, as its unique zoom capabilities allow the user to minimize the appearance of barrel distortion.[3] Keppler wrote in an informal review "You don't use this lens to make your best girl- or boyfriend look pretty or handsome, but it does produce some fantastically fascinating effects. [...] there still are many moments when its coverage just fits the coverage of my mind."[4]