Variable magnification finder

Details Variable magnification finder Variable magnification finder

G - Physics

03

B

G03B 13/10 (2006.01) G02B 15/177 (2006.01) G03B 13/12 (2006.01) G02B 23/14 (2006.01)

Patent

CA 2154209

A variable magnification finder has an objective lens group having an overall positive power. A first lens group and a second lens group each have a negative refractive power; a third lens group and a fourth lens group each have a positive refractive power; and an eyepiece lens group has a positive power. The second and third lens groups move to zooming from the wide angle position to the telephoto position, and compensate the change of an aberration resulting from such movement of the second and third lens groups.

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