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 three components only > arranged + - +

Child Classifications

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• G02B 9/16 all the components being simple
• G02B 9/18 only one component having a compound lens (G02B9/30 takes precedence)
• G02B 9/24 two of the components having compound lenses (G02B9/30 takes precedence)
• G02B 9/30 the middle component being a - compound meniscus having a + lens