Photographic objectives used as visuals

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  • #575138
    Gianni
    Participant

    Good morning everyone

    I am kindly asking you for information about two photographic lenses (Taylor Cooke f530 mm A1/10; Tessar Zeiss f600 mm, A1/9). These lenses are famous for their perfection. Therefore, I have tried to use them as objectives for visual observation, but they are no good. Both give a clear view at low magnifications, up to about 20X. Then, at higher X magnifications, a slight lactescence of the image starts to appear. After 40-50X the image is devastated and the defects become intolerable. I use normal eyepieces.

    Is there any website where I can find the technical characteristics of these vintage ones?

    Thank you very much and best regards.

    (translated from Italian with DeepL)

    #585133
    Denis Buczynski
    Participant

    Write to The Antique Telescope Forum, there ar lots of experts involved in that group who will be able to give you the information you need.

    http://www.oldscope.org/

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