![]() | |
Maker | Pentax |
---|---|
Technical data | |
Type | Zoom |
Focus drive | screw |
Focal length | 17–28mm |
Crop factor | 1 |
Aperture (max/min) | f/3.5-4.5 |
Close focus distance | 0.45 m (1 ft 6 in)[1] |
Max. magnification | 0.07[1] |
Construction | 9 elements in 7 groups |
Features | |
Lens-based stabilization | ![]() |
Macro capable | ![]() |
Unique features | Fisheye |
Application | Special Effect |
Physical | |
Max. length | 61 mm (2.4 in)[1] |
Diameter | 65 mm (2.6 in)[1] |
Weight | 255 g (9.0 oz)[1] |
Filter diameter | N/A |
Accessories | |
Lens hood | built-in |
Angle of view | |
Diagonal | 180°–90°[1] |
The smc Pentax-F 17–28mm Fish-eye f/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]