Optical: systems and elements – Prism – With reflecting surface
Patent
1994-12-29
1996-02-13
Gray, David M.
Optical: systems and elements
Prism
With reflecting surface
359676, G03B 118
Patent
active
054915279
ABSTRACT:
A taking optical system capable of trimming photography, wherein as the trimming magnification increases, the lens performance for the central area of an image frame on a negative film improves, thereby enabling photographs of excellent image quality to be obtained over the entire photography mode range, from ordinary photography to trimming photography. The taking optical system includes a plurality of lens groups arranged to enable at least two photography modes to be changed over from one to the other, the photography modes including a first mode in which a first image forming area is set for photography, and a second mode in which a second image forming area smaller than the first image forming area is set for photography. When the photography mode shifts from the first mode to the second mode, the spacing between the lens groups is changed, thereby effectively correcting aberrations in the second image forming area. Similar aberration correction can also be made by adjusting at least one of the surface configuration, refractive index and refractive index distribution of an optical element of the taking optical system.
REFERENCES:
patent: 3514182 (1970-05-01), Banks
patent: 5406344 (1995-04-01), Oshikiri et al.
Kikuchi Juro
Oshikiri Minoru
Gray David M.
Olympus Optical Co,. Ltd.
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