Pentax F 17–28mm lens

smc PENTAX-F FISH-EYE ZOOM 17mm–28mm F3.5-4.5
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  No
Macro capable  No
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.

History and design

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]

References

  1. 1 2 3 4 5 6 "F-ZOOM Lenses". Pentax. 1999. Archived from the original on 24 August 1999. Retrieved 6 November 2017.
  2. ↑ US patent 5724193A, Hirakawa, Jun, "Super wide angle zoom lens", published 1998-03-03, issued 1998-03-03, assigned to Pentax Corp
  3. ↑ Keppler, Herbert (August 2006). "SLR: World-Class Glass". Popular Photography. Retrieved 5 November 2017.
  4. ↑ Keppler, Herbert (September 1996). "17mm fisheye to 28mm wide-angle zoom: What a wacky idea, or is it?". Popular Photography. Retrieved 5 November 2017.
  • Hirakawa, Jun (1997). "魚眼ズームレンズの開発" [Development of Fish-eye Zoom Lens]. 日本写真学会誌 [Journal of the Japan Photographic Society]: 94–97. Retrieved 6 November 2017.
  • "smc PENTAX-F FISH-EYE 17-28mm F3.5-4.5". flickr. Retrieved 5 November 2017.
  • Silber, Julia (June 2006). "Fisheye View". Popular Photography. Retrieved 5 November 2017.
  • Keppler, Herbert (January 2008). "Lens First". Popular Photography. Retrieved 5 November 2017.
  • "smc PENTAX-F 17-28mm f/3.5-4.5 Fish-Eye". shutter releasing [blog]. 12 July 2012. Retrieved 6 November 2017.

Specifications

  • "Lenses: 35mm: F-ZOOM". Pentax USA. Archived from the original on 18 June 2004. Retrieved 5 November 2017.
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