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Thread: Rapid Rectinear lens -- front or rear elements for doubling the focal length

  1. #1

    Join Date
    Jan 2001
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    4,590

    Rapid Rectinear lens -- front or rear elements for doubling the focal length

    It's a Centar Series 2 convertible lens of about 11" focal length. Would it be better to use the front or rear elements to double the focal length?
    (Absolutely Gorgeous image used normally!)
    Thanks.
    Wilhelm (Sarasota)

  2. #2
    Tracy Storer's Avatar
    Join Date
    Nov 2001
    Location
    Oakland CA
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    889

    Re: Rapid Rectinear lens -- front or rear elements for doubling the focal length

    Off the top of my head, RRs are symmetrical, so either cell should do. Generally, you're better off usng single cells behind the stop, but if extension is an issue, you can go in front.
    Tracy Storer
    Mammoth Camera Company tm
    www.mammothcamera.com

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