arranged + -- +

Full Title

Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - (G02B15/00 takes precedence) > having four components only > arranged + -- +

6 direct subcodes

Child Classifications

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G02B 9/38 both - components being meniscus
G02B 9/44 both - components being biconcave
G02B 9/50 both + components being meniscus
G02B 9/52 the rear + component being compound
G02B 9/54 the front + component being compound
G02B 9/56 all components being simple lenses