RE: DCB Obs 2/20/09

From: Greg Roberts (
Date: Sun Feb 22 2009 - 09:35:57 UTC

  • Next message: Russell Eberst: "2009FEB21.OBS Part II"

    Morning Derek
    Glad you have seen the light :-)). 
    I was beginning to get a bit frustrated :-)). 
    Its actually quite simple -  the time you want is the time the image first 
    changes "state", and of course make sure you measure the end  of the 
    trail thats in the direction of motion since the image is "dumped" at the
    end of the exposure. If you measure the other end it will be earlier by 
    the duration of your integration - Ive made this mistake from time to 
    time and even quite recently!
    You have got the measuring part 100% so that is not a problem.
    Good luck
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