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depends on the software. I use Nebulosity and that can make a bad pixel map in one keystoke using a single dark frame (you can also vary the settings if you want). Once it knows the locations of hot pixels it can then use the bad pixel map in initial processing (prior to deBayer) to replace the bad pixels in all of your light frames. Doesn't change the lights in any other way.
When using bad pixel mapping it is also worth dithering when gathering your data so that any warmer than normal pixels that remain after the hot ones are removed, are spread about when you do the stacking and are not noticeable.
as a personal observation, the QHY8 is standing the test of time rather well - still produces very smooth images and is fairly sensitive as well.
Last edited by Shiraz; 28-12-2012 at 08:03 PM.
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