Combination lens system with attachment lens

Details Combination lens system with attachment lens Combination lens system with attachment lens

1978-09-07

1981-03-03

Clark, Conrad J.

350463, 350464, G02B 1512, G02B 1302

Patent

active

042537363

ABSTRACT:
A combination lens system including a camera objective and a rear attachment therefor. The objective is preferably of the telephoto type comprising a front group having a positive focal length and a rear group having a negative focal length. The rear group is axially movable in whole or in part to increase the back focal length of the telephoto objective. The attachment lens has a negative focal length and consists of a plurality of lens elements. The axial separation between the front group and the attachment lens is maintained constant during the time when the rear lens group or sub-group thereof is moved to control the adjustment of the back focal distance.

REFERENCES:
patent: 3388650 (1968-01-01), Westphalen
patent: 3854797 (1974-12-01), Yokota

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