Quote:
Originally Posted by batema
If I could ask one more question it would be can I use a series of flats I took in Feb for an image I took 2 nights ago and if I take a number of different nights (both lights and darks) can I bung the whole lot into DSS and stack that or do I have to stack the individual nights and then somehow stack the final of each of the nights. Not sure how to do the last if required.
Mark
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Darks from a previous session can be used providing they were taken at near enough to the same temprature. If you are going to be critical then the darks should be taken at the same sensor temprature. This can be difficult with a DSLR as the senson temprature changes with every image taken. The answer is Darks= maybe OK but Flats are a different item to deal with. They are an illumination map and irregularity map of the entire imaging train. They assist in the removal of imperfections such as dust and dirt in the imaging train and as such MUST be the exact setup and alignment used to shoot the lights. Flats should be taken during or at the end of an imaging session before any changes have been made to focus, camera alinment and filters etc in the imaging train.
This will improve your images immencely.
Good luck with it all. It seems like a lot of work but with practice it is quite a quick and easy process.