Wide annulus unit power optical system

Details Wide annulus unit power optical system Wide annulus unit power optical system

G - Physics

02

B

88/104

G02B 17/08 (2006.01) G03F 7/20 (2006.01)

Patent

CA 1103498

A B S T R A C T This invention provides, in a restricted off-axis field optical system having a broad spectral range, which includes refracting elements, the improvement comprising: an optical system constructed and arranged so that the Petzval sum is substantially zero and the refracting elements balance the effects of the variation in the Petzval sum due to variation in color by introducing axial chromatic aberration of the opposite sense so that the position of focus at the off-axis field remains substantially constant.

294050

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