3600 second exposure limit and how to get around it?

Discussion in 'STF Series CCD Cameras' started by Alan, Jan 24, 2016.

  1. Alan

    Alan Standard User

    Joined:
    Jan 24, 2016
    Messages:
    2
    Hi,
    I really like my ST-8300m. I especially enjoy the narrowband imaging at 1 hour exposures. I realized when I wanted to go longer the spec says 3600 seconds is the limit. Wondering, what can I do to extend the exposure length? Do I send the camera back, is a firmware upgrade available or ? If there is no solution, may I ask why the limit? I really like the longer exposures and would like to try further/deeper and discover/understand the trade offs as I am doing it. Again, I reslly really like your camera. If you could help, it would be greatly appreciated.

    Thanks and best regards,

    Alan
     
  2. Adam Robichaud

    Adam Robichaud Lead Developer Staff Member

    Joined:
    Sep 29, 2014
    Messages:
    902
    Location:
    Ottawa
    Technically, there's no real reason you can't take an exposure longer than an hour... The driver (SBIGUDrv) and camera firmware has a hard limit of 16777215 ms (approximately 4.6 hours), so if you request a 4 hour exposure, the camera should just deliver. This is independent of well-depth, of course. I presume you're pointing at a section of dark sky that won't saturate the pixels in that time.
     
  3. Alan

    Alan Standard User

    Joined:
    Jan 24, 2016
    Messages:
    2
    Hi Adam,
    Fantastic and that true upper limit is good to know! I expect based on the current exposures at 1 hour I should be able to go at least 2 to 3 hours before saturating. I will cross my fingers on the guiding.

    Thank you!!

    Alan
     

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