Variable focal length photo-taking optical system

Details Variable focal length photo-taking optical system Variable focal length photo-taking optical system

1989-08-23

1991-09-24

Sugarman, Scott J.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359672, 359680, 359683, G02B 1502

Patent

active

050509713

ABSTRACT:
A variable focal length photo-taking optical system includes a photo-taking objective lens, and a conversion lens removably added to the photo-taking objective lens and relatively movable along the optic axis with at least some lens groups of the photo-taking objective lens to change the combined focal length of the photo-taking objective lens and the conversion lens.

REFERENCES:
patent: 4591234 (1986-05-01), Hamanishi

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