the middle component being a - compound meniscus having a + lens

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 three components only > arranged + - + > the middle component being a - compound meniscus having a + lens

Child Classifications

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• G02B 9/32 the + lens being a meniscus