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GX1, strange behavior with high iso

Discussion in 'Panasonic Cameras' started by Simone, Oct 29, 2013.

  1. Simone

    Simone Mu-43 Regular

    33
    Oct 22, 2013
    Roma, Italia
    I noticed that in Manual Mode, using a high ISO lead to a very delayed noise (shutter?) when you shot a picture, after the shutter opening, even if you set time to 1/80s. At 160 iso all is ok, but for example at 3200 iso or more, there's a mechanical noise AFTER about 1/2s the shutter opening. But the shutter duration is 1/80s as set before. The max number of frames if you keep the shutter button pressed is lowered to about 1 picture/second!

    Disabling the "NR with long exposure" mode, revert to a fast shot (4 pictures taken every second, as normal in High speed mode).

    Some ideas about the mechanical noise?

    Simone
     
  2. gochugogi

    gochugogi Mu-43 Veteran

    That's a feature and not a defect! You had dark frame noise reduction set: camera closes the shutter and takes a picture of nothing and uses it as a guide to reduce noise, hence the delay and mechanical sound.
     
  3. Simone

    Simone Mu-43 Regular

    33
    Oct 22, 2013
    Roma, Italia
    What?

    What?! This is very interesting! Where did you read about this? Thanks a lot!

    Simon
    :eek:
     
  4. wjiang

    wjiang Mu-43 Hall of Famer

    This is a well known technique that can be (and used to be) done manually by shooting a long exposure, then shooting another equally long exposure with the lens cap on, and using software to subtract the common mode noise between the dark (cap on) frame and the actual exposure. It's odd that your camera engages it even for exposures that aren't all that long - on my E-M5 setting dark frame noise reduction to AUTO means it only gets engaged for exposures longer than a few seconds.