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  1. #1
    ruilourosa's Avatar
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    BUILDING A LENS... PERISKOP? DOUBLE ACHROMAT?

    Hello

    I am trying to build a lens... a simple lens... i would like to have a 750 to 1000mm i would prefer to have a simple construction, but a positive meniscus have a lot of difusion... would a steinhel periskop be any better? built out of 2 positive meniscus around a diafragm? or an achromat doublet? or an achromat doublet on either side of a diafragm...

    also where can i buy lenses to make a photo lens of this type (cheap)


    THanks


    Rui Lourosa
    vive la resistance!

  2. #2

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    Quote Originally Posted by ruilourosa View Post
    Hello

    I am trying to build a lens... a simple lens... i would like to have a 750 to 1000mm i would prefer to have a simple construction, but a positive meniscus have a lot of difusion... would a steinhel periskop be any better? built out of 2 positive meniscus around a diafragm? or an achromat doublet? or an achromat doublet on either side of a diafragm...

    also where can i buy lenses to make a photo lens of this type (cheap)


    THanks


    Rui Lourosa
    You should look at www.surplusshed.com

    David

  3. #3
    eclarke's Avatar
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    Or, check with Reinhold..He's making a reasonable priced 1000mm now.

    http://www.re-inventedphotoequip.com...gurations.html

  4. #4
    Mark Fisher's Avatar
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    I believe his lenses are single element lenses. If you actually want something reasonably sharp and not hard to build,consider a symmetric lens using simple lenses or achromats around a central aperture. If you haven't already, look at Alan Greene's book Primitive Photography. I have a couple of examples of a 300mm symmetric stopped to f64 onto 8x10 in this flickr set.
    Your first 10,000 pictures are the worst - HCB

    www.markjamesfisher.com



 

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