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Even with small pixels, I have never found dust bunnies to be the slightest problem at f4 and with clean optics - probably quite a different story at f8. Dithering plus sigma rejection seems to get rid of any slightly darker small stuff as well as all the bright stuff, although I have had to use Nebulosity's hot pixel rejection on one set of subs when the dithering overlaid a few hot pixels and PI sigma reject could not quite handle it.
Last edited by Shiraz; 01-11-2013 at 03:43 PM.
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