For instance, the Nikon F2 has a distortion free finder, but most other Nikon cameras have pincushion distortion deliberately designed into their finders to compensate for the barrel distortion typical in the 50mm f/1.
Straight lines remain straight (distortion free). "θ" has to be smaller than 90°. The aperture angle is gaged symmetrically to the optical axis and has to be smaller than 180°. Large aperture angles are difficult to design and lead to high prices.
A Nikkor lens specifically designed for high magnification macro photography, distortion free, capable of a ratio between 1:1 (life size) and 1:2, unaided by other accessories.
Nikonians Photo Glossary ...
The Panasonic FZ35 is the only camera that does not need to apply any distortion correction - at this particular focal length its lens is as good as distortion free (we also opened its files in RawTherapee to make sure distortion wasn't corrected by ...
 See also: Photograph, Distortion, Normal, Capture, Camera
  
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