Lenses

Details Lenses Lenses

1977-09-20

1980-01-15

Sacher, Paul A.

G02B 960

Patent

active

041836260

ABSTRACT:
The invention provides a telephoto lens with a positive front group of lens elements, a negative middle group of lens elements and a rear positive part comprising a lens element or group of lens elements. The front group of elements includes at least one positive doublet consisting of a positive element of a crown glass type in front of a negative element of a flint glass type having a positive red relative partial dispersion coefficient deviation. The middle group of elements includes a positive lens element of a crown glass type and a negative lens element of a flint glass type having a positive red relative partial dispersion coefficient deviation. The rear element or group of elements may consist of a doublet component comprising a negative bi-concave element and a positive bi-convex element, the rear part of the telephoto lens being well separated from the negative middle part.

REFERENCES:
patent: 3236151 (1966-02-01), Solisch et al.

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