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Old 29-09-2009, 01:00 PM
avandonk's Avatar

avandonk is offline
Join Date: Aug 2005
Location: Melbourne
Posts: 4,786
Take a series of of bias frames and if they are relatively the same it is normal sensor bias. If there is a major difference it is EM interference.

How you get rid of bias etc.

Take flats and darks at the same exposure and temperature as your flats

Take darks at the same temperature as your lights.

Take bias frames as well if you need to remove noise from your lights with darks at a different temperatures.

Here is a single exposure at 1min at f/5 at 300mm with 1600 ISO corrected for darks and flats and stretched. 1.3MB

Here is a good start


Last edited by avandonk; 29-09-2009 at 01:51 PM.
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