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    Re: Star CN with DSLR Camera
    From: Greg Rudzinski
    Date: 2011 Sep 29, 09:35 -0700

    Alan,

    Explore some of the previous threads on camera CN here:

    http://www.google.com/search?hl=en&sitesearch=fer3.com&q=DSLR+camera+celestial+navigation+NavList&btnG=Search&oq=DSLR+camera+celestial+navigation+NavList&aq=f&aqi=&aql=1&gs_sm=s&gs_upl=11813l25006l0l28774l3l3l0l0l0l0l1195l1668l2-2.7-1l3l0

    Getting Hs out of a camera requires taking a set of UT timed images (at least 20) through the field of view of a prime fixed focal length lens. From a known position each image needs to have sight reduction performed to a zero intercept. Formula,graphs, and tables can then be made to be kept with the lens so that an Hs can be derived from any pixel height above the horizon using a minutes of arc per pixel value multiplied by the pixel height of the body above the horizon. I find the graph convenient to use on my lap top.

    Greg Rudzinski
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