Varifocal objective for photographic camera

Details Varifocal objective for photographic camera Varifocal objective for photographic camera

1979-07-09

1980-12-16

Sacher, Paul A.

G02B 1518

Patent

active

042393396

ABSTRACT:
The disclosed camera objective has a fixed rear lens group preceded by a four-component front group with negatively refracting second and third components which are axially shiftable between positively refracting first and fourth components to establish a minimum overall focal length F.sub.min and a maximum overall focal length F.sub.max with a ratio of about 1:2. The substantially stationary first component consists of a negative front lens (which may be limitedly shiftable for focusing purposes) followed by three positive lenses while the movable second component consists of two negative lenses followed by a positive lens; the movable third component and the fixed fourth component are constituted by a negative and a positive lens, respectively. The range of overall focal lengths, the image diagonal and the back-focal length of the objective as well as the individual focal lengths of the first and fourth components and of the rear lens group all lie between the absolute magnitudes of the individual focal lengths of the second and third components.

REFERENCES:
patent: 3891304 (1975-06-01), Muszumanski et al.
patent: 4087160 (1978-05-01), Besenmalter et al.

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