Advice with using and focussing Acutte Matte D WLF Screens on Hasselblads

Discussion in 'Medium Format Cameras and Accessories' started by ted_smith, Jan 15, 2012.

  1. ted_smith

    ted_smith Member

    Messages:
    447
    Joined:
    Feb 19, 2008
    Location:
    uk
    Shooter:
    Multi Format
    Hi

    Based on my new experiences of using my Blad, I am seeking some focusing screen \ WLF tips. Mine has an Acute Matte D, which I gather was an improvement over the Acutte Matt types, but are famed for being a bit tricker to focus than the old fashioned ones?

    I find that if I just look down as normal into the chimney, I seem to be able to focus OK (my eyesight permitting, which needs glasses) - the shot looks nice in the viewfinder. I did notice that the view seems to "move" a little, in that the brightness\contrast\focus seems to dodge about if I move my eye around but I read http://photo.net/medium-format-photography-forum/00U9Xb?start=0 which states that the AMD screens have a sweet spot which one needs to get used to and try to utilise every time. True or false?

    More significantly, I get the view into what looks like focused, but when I pop up the little magnifyer, it isn't in focus, but then if I press my eye right up to the magnifyer to the point that my eye lashes are bent over it, I think it looks OK and I can fine tune it. Does that sound normal or should the magnified view match the higher WLF view? I read somewhere that the magnifyer can be adjusted for individual eye sight, a bit like viewfinders on the F5, but I haven't worked out how or if that can be done with mine?

    Any advice\guidance?
     
  2. ted_smith

    ted_smith Member

    Messages:
    447
    Joined:
    Feb 19, 2008
    Location:
    uk
    Shooter:
    Multi Format
  3. j_landecker

    j_landecker Member

    Messages:
    148
    Joined:
    Apr 18, 2004
    Location:
    Vancouver, B
    Shooter:
    Large Format
    If you push the magnifier in a little and the view gets clearer, it could be that the diopter is too positive for your eyes. I found this to be the case with the standard 0 diopter magnifier, and switched to a -1. The precision of focusing is mainly a matter of magnification - personally I could never focus reliably with my eye away from the WLF finder (unless scale focusing).
     
  4. ted_smith

    ted_smith Member

    Messages:
    447
    Joined:
    Feb 19, 2008
    Location:
    uk
    Shooter:
    Multi Format
    OK, interesting. I will bear that in mind. Thanks

    So in your experience, if it looks pretty sharp in the WLF without the magnifyer, there was a fair chance it was in focus OK? I'll find this out myself when my film is developed and returned but that won't be for a few weeks, thus my eagerness to determine if I am doing something wrong.
     
  5. film_man

    film_man Member

    Messages:
    751
    Joined:
    Dec 17, 2009
    Location:
    London
    Shooter:
    Multi Format
    Can't say I've had such issues, it works fine both with the WLF an my PM90 prism. I find the magnifier to be spot on without having to push my eye hard onto it. I am slightly long sighted but both WLF/Prism have the 0 diopter and I have no issue. I know, not much help!

    One thing with the WLF is to be careful not to focus then lift your head up and then shoot. Just by doing that you shifted your body and camera so focus moved which, depending on conditions, may or may not affect focusing.
     
  6. j_landecker

    j_landecker Member

    Messages:
    148
    Joined:
    Apr 18, 2004
    Location:
    Vancouver, B
    Shooter:
    Large Format
    My point was more that I'm unable to reliably get accurate focus without using the magnifier, unless using the depth of field scales to "zone focus" (usually with wide angle lenses, although even then I use the magnifier to check). So my recommendation is to use the magnifier whenever possible.
     
  7. RalphLambrecht

    RalphLambrecht Subscriber

    Messages:
    8,214
    Joined:
    Sep 19, 2003
    Location:
    Florida
    Shooter:
    Multi Format
    get an split-image finder. and all is well
     
  8. markbarendt

    markbarendt Subscriber

    Messages:
    7,519
    Joined:
    May 18, 2008
    Location:
    Beaverton, OR
    Shooter:
    Multi Format
    +1

    Just got one for my RB and it is pretty cool.