RE: Measuring accuracy of camera time codes

From: Derek C Breit (breit_ideas@hotmail.com)
Date: Tue Jun 02 2009 - 21:40:12 UTC

  • Next message: George Roberts: "Re: Measuring accuracy of camera time codes"

    There is no need for 1/10s resolution, because it is not possible to achieve
    that resolution from a laptop..
    
    At least not without a lot of work and testing.. Even then you cannot
    acquire that level of accuracy in actual use..
    
    There is generally only one way to achieve accurate time, and that is via a
    1PPS output from a GPS, such as provided by the now longer produced KIWI
    OSD..
    
    Derek
    
    
    
    
    
    
    
    I created a little web-app that calibrates a digital camera's time delay and
    
    lets you know exactly when it is that your camera recorded the time.
    
    For my Nikon D70, if I do a 2 second exposure followed by a 2 second noise 
    reduction dark frame step - the time is the end of the original exposure
    (and 
    before the 2 second dark frame).  This is different than Marco's camera
    which 
    records the time at the start of the exposure.  Unfortunately my camera only
    
    stores the time to a 1 second resolution - no tenths of seconds (or finer)
    so 
    this whole feature is kind of useless for satellite timing.  Better to
    trigger 
    the camera with my laptop at a very accurate time.  I already have software
    to 
    do that.
    
    Here is the application- it's very simple - basically take a picture of the 
    screen at the website below.  Try it out even if you don't have a digital
    camera 
    and you'll see how it basically works:
    
    http://gr5.org/calibrator.htm
    
    Feel free to steal it and post it on your own website.
    
    - George Roberts
    http://gr5.org 
    
    
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