Zoom lens having extended focusing range

Details Zoom lens having extended focusing range Zoom lens having extended focusing range

1978-05-03

1980-12-23

Sacher, Paul A.

G02B 1518

Patent

active

042406994

ABSTRACT:
A method of designing a telephoto type zoom lens having a convergent front member movable for focusing and capable of providing focusing down to as short an object distance as 6.5 times the longest focal length to achieve good stabilization of correction of spherical aberration on adjustment of the other aberrations within predetermined limits throughout the extended focusing range even when zooming is effected to the telephoto settings. This is accomplished by means of the formula:

REFERENCES:
patent: 3336094 (1967-08-01), Macher
patent: 3615125 (1971-10-01), Higuchi et al.

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