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Thread: Puyo lens

  1. #31

    Join Date
    Sep 2007
    Location
    AZ
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    2,627

    Re: Puyo lens

    Quote Originally Posted by eddie View Post
    hey jim ,

    can you save me some film....do i focus closer (more bellows extension) to get chemical focus or the opposite. about how much for a give FL? what is your focal length and how much do you adjust it?

    thanks for the help.

    eddie
    Eddie,
    Adjust half as far as twice the focal length. Either way, in or out. Glad to help.

  2. #32

    Join Date
    Dec 2006
    Location
    Hamilton, Canada
    Posts
    937

    Re: Puyo lens

    Quote Originally Posted by goamules View Post
    Eddie,
    Adjust half as far as twice the focal length. Either way, in or out. Glad to help.
    Half of 2X the focal length IS the focal length?
    Regards
    Bill

  3. #33

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    3,834

    Re: Puyo lens

    Isn't it 1/400th of the focal length added to the visual focussing length to obtain the actinic in-focus position?

    Example, 150mm lens - sharp visual focus at 147mm - actinic focus is at 147.375mm.
    I am surprised more objectives didn't have the fixed built in adjustment lever that the Rodenstock Bistigmat had.
    Last edited by Steven Tribe; 14-Oct-2010 at 11:56.

  4. #34

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    Sep 2007
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    AZ
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    Re: Puyo lens

    Quote Originally Posted by cowanw View Post
    Half of 2X the focal length IS the focal length?
    Regards
    Bill
    Exactly.

  5. #35

    Join Date
    Dec 2006
    Location
    Hamilton, Canada
    Posts
    937

    Re: Puyo lens

    Quote Originally Posted by goamules View Post
    Exactly.
    But that means you adjust your lens which is at infinity down to zero bellows length or 2X bellows length. (either way in or out) for chemical focus
    Regards
    Bill
    Or am I missing an in joke?

  6. #36

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    Sep 2007
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    AZ
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    Re: Puyo lens

    I was just joking with Eddie.

  7. #37

    Join Date
    Jul 2007
    Location
    Denmark, Europe
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    1,570

    Re: Puyo lens

    Quote Originally Posted by Steven Tribe View Post
    Isn't it 1/400th of the focal length added to the visual focussing length to obtain the actinic in-focus position?

    Example, 150mm lens - sharp visual focus at 147mm - actinic focus is at 147.375mm.
    I am surprised more objectives didn't have the fixed built in adjustment lever that the Rodenstock Bistigmat had.
    AHA!! so that's what that is.... I was wondering.

    about the focusing. there's something here:

    http://lensn2shutter.com/busch-vademecum.html

  8. #38

    Re: Puyo lens

    I the humble buyer received the mystery item today and when my week of family gathering ends I will dutyfully open and clean the lens and mount it ! I will let you guys informed of the improvement (can't be harder than trying to understand my daughter when she speaks her barbaric celtic)
    Besides from the link posted here I think it's the later edition of objectif d'artiste, "le nouveau" ..

  9. #39

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    3,834

    Re: Puyo lens

    Would that be Breton, Manx, Irish, Welsh, Gaelic or Cornish (which would be a sensation!)?
    Remember to send good photos til CCHarrison for soft lens update!

  10. #40

    Re: Puyo lens

    Quote Originally Posted by Steven Tribe View Post
    Would that be Breton, Manx, Irish, Welsh, Gaelic or Cornish (which would be a sensation!)?
    Remember to send good photos til CCHarrison for soft lens update!
    Demat, That would be breton!

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