Patent classifications
G
PHYSICS
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G02
OPTICS
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G02B
OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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15/00
Optical objectives with means for varying the magnification
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G02B15/14
by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
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G02B15/16
with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
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G02B15/163
having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
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G02B15/167
having an additional fixed front lens or group of lenses
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