Comet Holmes

In 2007 a comet passed through our neighborhood and allowed me a chance to try the high dynamic range (HDR) imaging techniques that were being developed at that time.  The idea is to combine a range of exposures to get a large range of detail.  In this case 10 exposures covering the range from 1 second to 8 minutes are combined, selecting the best tonal information from each.  This allows the otherwise obscured ion cloud surrounding the dusty nucleus to become visible as a faint blue-green glow.  I was able to use this image as an HDR example in a conference presentation I made on this topic the following week.

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2 November 2007
Takahashi CN212 in Newtonian configuration (f/4)
Canon EOS 20Da, ISO 800

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