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I thought flats should be the same length as darks and lights? Or is this applies in different scenarios? The latop birghtness on my laptop wasnt bright enough.
I read that you take takes flats and darks at other times, when the weather isnt too good for instance, and then create master flats and darks and use these for most processing, so that you can just focus on lights during imaging sessions and not the rest. Would definitely save time, as I learnt the hard way last night.
Thanks for the feedback guys
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Ok, you can create a darks library, Ie, take 15x15min/15x10min/15x5min at ISO400, ISO800 and ISO1600, save these somewhere on your hard drive, and use them for your darks in your images you take from then on, although, temperature affects darks too.. So essentially you would need darks for every 5 degree difference in temperature... so, all the above images, for 5/10/15/20 degrees C... Thats a hell of a lot of darks to have, but it would make life fantastically easy from then on.
Now, Flats.... You can't make a flats library, becaues your flats will almost always be different.. you could get more dust on your scope, or clean dust off your scope, get dust in your camera sensor, or have your sensor cleaned, your focus position could change slightly, you could rotate your camera to more than 360 different angles in the focuser, all of these things would make a flats library useless. Flats need to be taken without having moved the focuser or camera....
Flats dont need to be at the same temperature as the lights/darks, so they can be done the next day... their exposure time varies on the brightness of the source.. it does not have to be the same length (nor should it ever be) the length of your lights.