Optical objective with extended varifocal range

Details Optical objective with extended varifocal range Optical objective with extended varifocal range

1977-12-02

1980-04-08

Henry, Jon W.

350184, G02B 1518, G02B 710

Patent

active

041969707

ABSTRACT:
An objective of a photographic or cinematographic camera has an adjustable four-component front lens group and a fixed rear lens group. Axial displacement of the movable second and third components of the front group establishes a normal varifocal range in which the overall focal length varies between a minimum value f.sub.min and a maximum value f.sub.max having a ratio of 1:6. In the presence of a front attachment with a negatively refracting additional lens member, further shifting of the two movable components establishes an extended wide-angle range with focal lengths smaller than f.sub.min ; similarly, in the presence of a front attachment with a positively refracting additional lens member the two movable components are shiftable to establish an extended telephoto range with focal lengths greater than f.sub.max. Between the normal and wide-angle ranges the third component is also shiftable, without attachment, to focus in a macro range.

REFERENCES:
patent: 3773402 (1973-11-01), Gela et al.
patent: 4078857 (1978-03-01), Kantner et al.
patent: 4110005 (1978-08-01), Bohm et al.
patent: 4113355 (1978-09-01), Tsuji et al.

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