Quote:
Originally Posted by Hagar
Thanks for the advice Greg. I actually stretched the old tea shirt over the scope this evening and put the EL sheet on top of that and managed some 1 sec flats that don't look too bad but again that was at 1 x 1 binning only. 4 x 4 was still blown out at 0.001 sec.
Tonight I am looking at the same capture using 1 x 1 and the same exposure time to see the diference. Should be an interesting exercise.
Looks like I still have a few items to contend with regarding flats but I will get to the bottom of it eventually. It has to wait until night as it is way to hot in the observatory during the day.
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If you can get a reasonable exposure with the 1x1 binning just use that. Divide the image by 16 and then bin the result 4x4. This will give you the 4x4 flat. For flats this works but not for darks.