CPC Main Group
G02B 13/00 Optical objectives specially designed for the purposes specified below (with variable magnification G02B15/00)
13 direct subcodes
Child Classifications
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- G02B 13/02 Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
- G02B 13/04 Reversed telephoto objectives
- G02B 13/06 Panoramic objectives; So-called "sky lenses"
- G02B 13/08 Anamorphotic objectives
- G02B 13/14 for use with infrared or ultraviolet radiation ( G02B13/16 take precedence)
- G02B 13/16 for use in conjunction with image converters or intensifiers
- G02B 13/18 with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
- G02B 13/20 Soft-focus objectives
- G02B 13/22 Telecentric objectives or lens systems
- G02B 13/24 for reproducing or copying at short object distances