Hassy split screens darkening

Discussion in 'Medium Format Cameras and Accessories' started by EASmithV, Dec 7, 2012.

  1. EASmithV

    EASmithV Member

    Messages:
    1,925
    Joined:
    Aug 22, 2008
    Location:
    Maryland
    Shooter:
    Multi Format
    Hello,

    I have a Hassy split screen on loan, basically, and I'm noticing that in lower light conditions with a 150mm f/4 lens it seems to get a bit dark in the split image circle.
    So far I really like it, and will probably end up getting it to keep it as an option, as it really helps when using the NC2 prism. However, the darkening issue is a bit of a concern. This is a non-acumatte version, would the acu-matte version eliminate this? I've read similar online, but I was wondering on hearing some first hand experiences. It does not seem to do this with the 60mm, only the 150, but seeing as how I need the 150 AND the NC2 at the same time for portraits and such, a split image screen that dosen't darken would be really valuable... So... Before I even think about the expense of another acu-matte screen with a split focus, I want to be sure it will actually suit my needs.

    Thank you!
     
  2. rolleiman

    rolleiman Member

    Messages:
    281
    Joined:
    Oct 27, 2011
    Shooter:
    Medium Format
    Split image screens are meant for use in good lighting conditions and favour lenses of 2.8 or faster. They are not ideal in low lighting conditions, where an acute matte screen would be better. Also split image screens were designed to be more useful with wide-angle lenses than with telephotos.
     
  3. brucemuir

    brucemuir Member

    Messages:
    2,266
    Joined:
    Dec 25, 2007
    Location:
    Metro DC are
    Shooter:
    Multi Format
    they all go half dark @ 5.6 and sometimes wider on longer glass.

    try centering you eye exactly over the split and it sometimes helps.
     
  4. Sirius Glass

    Sirius Glass Subscriber

    Messages:
    20,578
    Joined:
    Jan 18, 2007
    Location:
    Southern California
    Shooter:
    Multi Format
    They go dark at the larger f/stops and one half will go dark even sooner unless your pupil is lined up with the axis of the split image.
     
  5. cowanw

    cowanw Member

    Messages:
    1,289
    Joined:
    Aug 29, 2006
    Location:
    Hamilton, On
    Shooter:
    Large Format
    Therfore you have to move your eye around to see each half separately and estimate where the images line up. Quite doable but perhaps as easy just to look at he ground glass portion. Don't forget that if you ever use a exposure prism, the split screen is not recomended.
     
  6. Sirius Glass

    Sirius Glass Subscriber

    Messages:
    20,578
    Joined:
    Jan 18, 2007
    Location:
    Southern California
    Shooter:
    Multi Format
    I have had no problem with split screen and PME prism if I move my eye to the right position when the darkening occur.