Clueless loupe question

Discussion in 'Large Format Cameras and Accessories' started by Murray@uptowngallery, Jul 25, 2005.

  1. Murray@uptowngallery

    Murray@uptowngallery Member

    Messages:
    1,041
    Joined:
    Sep 24, 2003
    Location:
    Holland, MI
    Shooter:
    Pinhole
    It seems some loupes have a spacer so they sit flat and repeatedly at the same spacing from the ground glass.

    Is this important, or is any magnification helpful?

    Thanks
     
  2. Graeme Hird

    Graeme Hird Member

    Messages:
    696
    Joined:
    Jun 2, 2004
    Location:
    Fremantle, W
    Shooter:
    4x5 Format
    It doesn't matter, in my experience. Any magnification is fine - my own loupe never touches the GG and I hold it so that its axis points towards the lens from whichever angle I'm viewing the GG.

    Cheers,
     
  3. John Cook

    John Cook Member

    Messages:
    123
    Joined:
    Sep 5, 2004
    Location:
    Massachusett
    Shooter:
    4x5 Format
    The amount of magnification (power) is determined by the shape of the lens. The distance it is away from the ground glass has only to do with being in or out of sharp focus.

    At the typical loupe strength, the working distance is very touchy. Much easier to concentrate on what you are doing when you are not waving the loupe around trying to get it focused. Resting it on the ground glass is easier.

    From experience, I have concluded that about 4X is the best magnification. My (very) personal favorite is the Schneider.

    I have used loupes all the way up to 12X, which is too strong. I begin to concentrate on the molecular structure of the ground glass instead of the image focus.
     
  4. Rubin

    Rubin Member

    Messages:
    19
    Joined:
    Apr 27, 2005
    Shooter:
    Large Format
    I think that if you hold your lens you will have a more narrow view. I mean if it touch the GG you can see a larger portion of magnified space. I use a 6x and a 4x, both Schneider. The 6x is the best magnification for me.
    Rubin
     
  5. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member Moderator

    Messages:
    18,005
    Joined:
    Sep 7, 2002
    Location:
    Honolulu, Ha
    Shooter:
    Large Format
    It's easiest to use a focusable loupe that rests against the GG.

    My personal favorite is the current Schneider 4x (which has less distortion than the old Schneider 4x). I have a couple of 6x loupes as well. If you don't use a fresnel or if your fresnel isn't too intrusive, you might like a 6x, and the Silvestri 6x tilts so you can check the edges and corners with a wide lens. The Toyo 3.6x is handy if you use a camera with a folding GG hood, because it is a little longer than the others.
     
  6. Rubin

    Rubin Member

    Messages:
    19
    Joined:
    Apr 27, 2005
    Shooter:
    Large Format
    I have the Toyo 3,6 too, but it has a low magnification and it frames a rather small field. I like the new Schneiders also because of it.
     
  7. GeorgesGiralt

    GeorgesGiralt Member

    Messages:
    527
    Joined:
    Sep 16, 2004
    Location:
    Toulouse, Fr
    Shooter:
    Large Format
    Hi !
    As I'm aging, my vision is becoming worse. I've tried several loupes, but found the current set up I now use very good and comfortable : it is made from a projector lens (an old plastic Rollei lens made in Singapore I got for a pair of bucks) mounted on an opaque plastic tube. The trick is to custom cut the plastic tube at the exactfocussing dimension of the lens. This way, you rest the "thing" onto the GG and concentrate on focussing. Added bonus, as the tube is lightproof, you do not need the dark cloth and can keep your brain chill (usefull considering the outdoor temp these days).
    If you loose or break the set up, you won't break the bank to find a replacement, as it will be for a Schneider ;-)
    Just my 2 c...
     
  8. mikeb_z5

    mikeb_z5 Member

    Messages:
    217
    Joined:
    Feb 11, 2004
    Shooter:
    4x5 Format
    I found my calumet 7x too strong for me. I switched to a Mamiya 4x loupe and like it much more and it is reasonably priced at about $60.
     
  9. medform-norm

    medform-norm Member

    Messages:
    863
    Joined:
    Dec 5, 2004
    Location:
    Netherlands
    Shooter:
    Multi Format
    What we're currently using is a 6x Leitz occulair from a microscope that came free with a bunch of Leitz/Linhof stuff. We press it against the gg. On the focal plane of the gg (i.e. where the film plane will be) we have made a triangular, sharp angled, black marking (piece of tape). So, when focussing while looking through the loupe, we know the image is sharp if and when both the black marking and the background are sharp/in focus. We marked our gg in the centre as well as in the four corners. We're happy with the results till so far.

    (And when you forget to bring your loupe along, use a spare -shortish focal length- lens upside down.)
     
  10. Murray@uptowngallery

    Murray@uptowngallery Member

    Messages:
    1,041
    Joined:
    Sep 24, 2003
    Location:
    Holland, MI
    Shooter:
    Pinhole
    Thanks all.