Focus problem Graflex Graphic view

Discussion in 'Large Format Cameras and Accessories' started by henk@apug, Jun 10, 2012.

  1. henk@apug

    henk@apug Member

    Messages:
    186
    Joined:
    Jul 7, 2008
    Location:
    Belgium
    Shooter:
    Multi Format
    Hello,

    I am having a focus problem with my old graflex graphic view.

    What I did : no tilts, no swings
    Focussed on a certain point, take picture, check focus after removing film holder.
    Focus check was always ok after removing film holder.

    Problem : plane of sharp focus is about 7 meter before the plane I focussed on and this on every shot.
    I think the ground glass is positioned ok, since this is very simple on this camera.

    What could be he problem ?
    Very annoying.

    Thank you !
     
  2. henk@apug

    henk@apug Member

    Messages:
    186
    Joined:
    Jul 7, 2008
    Location:
    Belgium
    Shooter:
    Multi Format
    I want to add that I use a magnifying loop to focus
     
  3. Ian Grant

    Ian Grant Subscriber

    Messages:
    18,034
    Joined:
    Aug 2, 2004
    Location:
    West Midland
    Shooter:
    Multi Format
    Sounds like the register is out on the back, this maybe because a Fresnel screen is in the wrong place or missing.

    Ian
     
  4. bdial

    bdial Subscriber

    Messages:
    5,408
    Joined:
    Jan 2, 2005
    Location:
    NE U.S.
    Shooter:
    Multi Format
    What kind of film holders?
    Any possibilities they are actually glass plate holders without an insert for film?
     
  5. henk@apug

    henk@apug Member

    Messages:
    186
    Joined:
    Jul 7, 2008
    Location:
    Belgium
    Shooter:
    Multi Format
    Some images
    I use Fidelity Elite film holders
     

    Attached Files:

  6. henk@apug

    henk@apug Member

    Messages:
    186
    Joined:
    Jul 7, 2008
    Location:
    Belgium
    Shooter:
    Multi Format
    Oeps, there is apparently 1.5mm difference between the film plane
    and the ground glass !

    To other graflex graphic view owners, is there something between the ground glass
    and the metal to which it is pressed ?

    I do not understand this difference
     
  7. Ian Grant

    Ian Grant Subscriber

    Messages:
    18,034
    Joined:
    Aug 2, 2004
    Location:
    West Midland
    Shooter:
    Multi Format
    Probably a fresnel screen. Many (but not all) later Graflex cameras came with one fitted.

    If the focus frame was made to have one on the inside removal puts the focus out of register.

    Ian
     
  8. henk@apug

    henk@apug Member

    Messages:
    186
    Joined:
    Jul 7, 2008
    Location:
    Belgium
    Shooter:
    Multi Format
    Thanks Ian.

    I will try to get hold of a precise tool to measure the difference and
    adjust the GG or maybe put a fresnel.

    Anyone knows where I could get custom made fresnel ?

    I must say that in plane of sharp focus, the sharpness and detail is magnificent !
    So I have to get this right, more so because I fell in love with 4x5 photography :smile:
     
  9. Ian Grant

    Ian Grant Subscriber

    Messages:
    18,034
    Joined:
    Aug 2, 2004
    Location:
    West Midland
    Shooter:
    Multi Format
    Fresnels will differ in thickness, you need to find a Grflex one.

    Ian
     
  10. henk@apug

    henk@apug Member

    Messages:
    186
    Joined:
    Jul 7, 2008
    Location:
    Belgium
    Shooter:
    Multi Format
    I did some measurement wirh a calliper and got a difference from 1,5mm.
    I found a simple way to get the groundglass rearward by this distance, did some
    new tests and focus is now ok
     
  11. Ian Grant

    Ian Grant Subscriber

    Messages:
    18,034
    Joined:
    Aug 2, 2004
    Location:
    West Midland
    Shooter:
    Multi Format
    I was looking at some fresnels screens from a UK supplier (not specifically photographic) and they were 1.5mm thick so that makes sense.

    Ian
     
  12. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member Moderator

    Messages:
    17,940
    Joined:
    Sep 7, 2002
    Location:
    Honolulu, Ha
    Shooter:
    Large Format
    1.5mm is about what a fresnel is typically, so that sounds right to me as well. You can just shim it until you find the right fresnel.