1976-12-15
1978-11-07
Sacher, Paul A.
350255, G02B 1320
Patent
active
041242769
ABSTRACT:
A variable soft focus lens system particularly adapted for photography is provided. The soft focus lens system includes at least two lens groups defining a meniscus shaped air space there between. The relative width of the air space can be variable by movement of one of the lens groups relative to the other. This movement can introduce a controlled amount of spherical aberration to provide within certain parameters a soft focus image with an acceptable Petzval sum and flatness of the image plane. Various embodiments of the present invention within the inventive parameters can be utilized and include both stationary and variable soft focus lens system.
REFERENCES:
patent: 1446634 (1923-02-01), Bell et al.
patent: 1463132 (1923-07-01), Graf
patent: 2381098 (1945-08-01), Bahn
Nakamura Akiyoshi
Ogura Toshinobu
Okano Yukio
Jackson Harold L.
Jones Stanley R.
Minolta Camera Kabushiki Kaisha
Price Joseph W.
Sacher Paul A.
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