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Thread: My Dream lens.

  1. #121

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    Re: My Dream lens.

    Had a good read of the prospectus!

    Just a few things that seem a little "off"!

    - while some of the classic pictorial lenses are under-represented in shorter focal lengths - for example, Graf variable - the situation is different for meniscus lenses, like T,T & H RVP and Spencer Portland where the 6" -9" sizes are plentiful.

    - the availability of "vanity" serial numbers is IMHO a unfortunate reflection of current society. Real serial numbers is the best way ensure that the history of the TT lens era is written correctly in a century or two!

  2. #122
    Tin Can's Avatar
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    Re: My Dream lens.

    Very Interesting Tri Tran.

    What are the flange focal distances at infinity?

    I understand the desire and need for personalized numbering.

    Congratulations on bringing this product to market!
    sin eater

  3. #123
    Tri Tran's Avatar
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    Re: My Dream lens.

    [QUOTE=Tin Can;1507793]

    What are the flange focal distances at infinity?





    Hi , can you rephrase your question ? I dont quite understand what you mean. Thanks. TT

  4. #124
    Tin Can's Avatar
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    Re: My Dream lens.

    It is either the distance from the lens node, iris or mounting flange to the the film plane at infinity.


    Old thread with some explanations, https://www.largeformatphotography.i...=1#post1148610


    I have a Gundlach Portrait 16-1/4 f6 Achromatic Meniscus which has a much longer flange distance than 16".

    But I did not exactly measure it.
    sin eater

  5. #125
    Tri Tran's Avatar
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    Re: My Dream lens.



    8x10 plate
    12 in
    Xray film

  6. #126
    Tri Tran's Avatar
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    Re: My Dream lens.



    8x10 plate
    12 in
    Xray film

  7. #127
    Tin Can's Avatar
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    Re: My Dream lens.

    Like!

    Both
    sin eater

  8. #128
    Tri Tran's Avatar
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    Re: My Dream lens.

    Quote Originally Posted by Tin Can View Post
    Like!

    Both
    Thank you !

  9. #129
    Tri Tran's Avatar
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    Re: My Dream lens.



    8x10 plate
    12 in
    Xray film


  10. #130
    Nodda Duma's Avatar
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    Re: My Dream lens.

    Flange focal distance is the distance from the mounting flange to the image plane when the lens is focused at infinity. It is a mechanical distance usually unrelated to optical properties, except the “focused at infinity” convention.

    As an example, the Nikon F-mount has a standardized flange focal length of 46.5mm.
    Newly made large format dry plates available! Look:
    https://www.etsy.com/shop/Pictoriographica
    .. because my wife is happy when I can cover my photography expenses!

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