Variable magnification finder of real image type

Details Variable magnification finder of real image type Variable magnification finder of real image type

1989-08-08

1991-10-08

Brown, Brian W.

Optical: systems and elements

Prism

With reflecting surface

359676, G03B 1310

Patent

active

050558684

ABSTRACT:
A finder device is disclosed comprising a first lens group having a positive refractive power to form a first image, a second lens group having a positive refractive power to re-form the first image, and an eyepiece lens group having a positive refractive power to observe the image the second lens group forms, wherein zooming is performed by moving the first and second lens groups along respective different loci of motion from each other.

REFERENCES:
patent: 2437032 (1948-03-01), Korprelian
patent: 3989349 (1976-11-01), Besenmatter et al.

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