M240 question

Discussion in 'Leica M Camera Forum' started by Christilou, Nov 2, 2013.

  1. Christilou

    Christilou Leica Place Veteran

    404
    Apr 5, 2013
    I've been somewhat confused by the M. I think I have it in Aperture priority with auto iso and yet even though I set the aperture at 1.4 it displays a variety of f stops in the exif info both in LR and when I upload to flickr. I thought it might be me accidently moving the aperture (it's quite loose) but today I made sure. Despite having it in Aperture priority at 1.4, the exif reads 2.4. It has also displayed as 1.7 and 2.8 in the last few days. Thinking I may have it set in some kind of programme mode, I put it into Manual mode this evening. Despite using an aperture of 1.4 the iso remained at iso 200 and gave me and underexposure reading. Not sure if it's me or the camera..... any thoughts please?

    Further to this, I've read that the lens cannot tell the body what aperture it's using (yet) however, I'm still confused as to why the camera won't move the iso up to get a good exposure when it's in M mode and on auto iso?
     
  2. Brian

    Brian Super Moderator Subscribing Member

    Apr 3, 2013
    The F-sop recorded is just an estimate there is no connection to the camera.
     
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  3. ajramirez

    ajramirez Leica Place Veteran

    267
    Mar 30, 2013
    Caguas, Puerto Rico
    Antonio
    Assuming that it works as it does in the M9, as Brian stated, there is no connection to the camera. There is a small cell next to the rangefinder window which reads ambient light level. Based on a comparison with the TTL meter reading, the camera determines what the f-stop used was. The system does not appear to be terribly precise, though, as in my experience, it's frequently off by as much as a full stop.

    Can't help you as to auto ISO, as I have never used it.

    Cheers,

    Antonio
     
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  4. Christilou

    Christilou Leica Place Veteran

    404
    Apr 5, 2013