Site Sponsors
Results 1 to 6 of 6

Thread: Contax 645 and a brighter screen

  1. #1
    Member
    Join Date
    Nov 2010
    Location
    Ikaria
    Posts
    159
    Post Thanks / Like

    Contax 645 and a brighter screen

    I get that you dial down the iso setting on a film back to recompense for the faster shutter speed set by the “unnaturally" brighter light of an enhanced focusing screen with the prism finder on the Contax in average (not spot) meter mode, allowing continued use of aperture priority and the expo comp dial. But what to do with a digital back where changing the iso is a considered choice that can affect image quality? Am I missing something that I think this limits me to manual mode?
    Thanks for any further understanding.
    Martin

  2. #2
    Super Duper
    Senior Member
    carstenw's Avatar
    Join Date
    Nov 2007
    Location
    Berlin, Germany
    Posts
    2,530
    Post Thanks / Like

    Re: Contax 645 and a brighter screen

    Why not use exposure compensation and let the camera handle it, leaving the ISO as is on the back?
    Carsten - Website

  3. #3
    Member
    Join Date
    Nov 2010
    Location
    Ikaria
    Posts
    159
    Post Thanks / Like

    Re: Contax 645 and a brighter screen

    I understand what you're saying, Carsten, and that is my intention. But with the prism, doesn't a 2 stop increase in light to the meter mean overexposing 2 stops on the exposure compensation dial to get back to normal? The Contax dial only gives +/- 2 so my brain tells me that I'll only be able to use the dial from 0 to -4 stops with a 2 stop brighter screen. According to Bill Maxwell, his enhancement treatments can add up to almost 6 stops extra light, though usually about 2.

  4. #4
    Senior Member darr's Avatar
    Join Date
    Jan 2009
    Location
    North Florida
    Posts
    980
    Post Thanks / Like

    Re: Contax 645 and a brighter screen

    I would run exposure compensation tests in 1/3 stops till you find the correct compensation and it may change with different lenses. Even though the manufacture of the bright screen says you are receiving 2 stops more visible light in the viewfinder, you may be surprised to find that is not what the back is receiving. You can also try to find a repair facility that can re-calibrate the prism to the new screen. I personally would just shoot manually with a meter.

    Kind regards,
    Darr
    "Creativity takes courage." ~ Henri Matisse
    Darlene Almeda, photoscapes.com

  5. #5
    Super Duper
    Senior Member
    carstenw's Avatar
    Join Date
    Nov 2007
    Location
    Berlin, Germany
    Posts
    2,530
    Post Thanks / Like

    Re: Contax 645 and a brighter screen

    Hmm, I see what you mean. Well, it might mean manual mode is needed then, and possibly, as Darr says, meter manually.

    Btw, I think the Contax 645 has 1/2 stops, doesn't it?
    Carsten - Website

  6. #6
    Member
    Join Date
    Nov 2010
    Location
    Ikaria
    Posts
    159
    Post Thanks / Like

    Re: Contax 645 and a brighter screen

    You wish...one of its minor shortcomings is that the beautiful shutter speed dial does only spin around in full stops.

    Thanks Darr, that might be why I haven't let my Pentax spottie go yet ;>)

    Btw, this whole topic is really only relevant when using the Contax in 'convenience' mode i.e., aperture/shutter priority with the in-prism centre weighted metering. The spot meter is set up in the body, and is the only in-camera meter when using the wlf.

    Martin
    Last edited by arionelli; 6th December 2014 at 22:17.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •