How to focus a focusing loupe?

Discussion in 'Large Format Cameras and Accessories' started by jcc, Oct 1, 2013.

  1. jcc

    jcc Member

    Messages:
    495
    Joined:
    Jul 18, 2012
    Location:
    Norman, Okla
    Shooter:
    Multi Format
    I've been using a Fuji Professional 4x loupe, but it's gone somewhere into abyssal storage, so I'm borrowing a friend's Rodenstock aspheric 4x loupe. I wear glasses, so looking through the loupe does not render a sharp image. Is there a way to focus the Rodenstock loupe? I was able to do it adjust focus with the Fuji loupe, but can't figure out how it's done with the Rodenstock.

    Just to be clear, I'm asking about how to change the focus of the Rodenstock loupe, not focus of the camera. Thanks!
     
  2. ic-racer

    ic-racer Member

    Messages:
    7,483
    Joined:
    Feb 25, 2007
    Location:
    Midwest USA
    Shooter:
    Multi Format
    Twisting it doesn't do anything? It should go from +0.5 diopters to -2.5 diopters when you twist it.
     
  3. AgX

    AgX Member

    Messages:
    12,196
    Joined:
    Apr 5, 2007
    Location:
    Germany
    Shooter:
    Multi Format
    Have you tried it with the eye-cup rim downfolded?
     
  4. jcc

    jcc Member

    Messages:
    495
    Joined:
    Jul 18, 2012
    Location:
    Norman, Okla
    Shooter:
    Multi Format
    Twisting the only threaded part disassembles the lens from loupe. There's no depth control on the Rodenstock (which the Fuji has) that I can see.
     
  5. jcc

    jcc Member

    Messages:
    495
    Joined:
    Jul 18, 2012
    Location:
    Norman, Okla
    Shooter:
    Multi Format
    I tried it; along with various amounts and shapes of squinting (seriously, a good couple minutes worth). No luck.
     
  6. AgX

    AgX Member

    Messages:
    12,196
    Joined:
    Apr 5, 2007
    Location:
    Germany
    Shooter:
    Multi Format
    Most probably someone has twisted the focusung thread to arrest.