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  1. #1

    Join Date
    Mar 2006
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    Multi Format
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    10

    Reading lens reflections to determine type.

    I am still not clear how to read some lens reflections. I purchased a no-name brass lens from circa 1900. When I shine a light on a group (half the lens) I see one large bright reflection and one much smaller bright reflection. Does anyone know how to interpret this? Thanks.

  2. #2

    Join Date
    Nov 2007
    Location
    Tacoma, WA
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    Multi Format
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    560
    Probably easier to partially disassemble the lens to see what the configuration is. I.e. if it has a cemented doublet and an airspaced pair then it's a petzval (I think) etc etc..



 

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