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Always convert CR2 (RAW) files to TIFF files using the Canon software (Digital Photo Professional) - then you can stack in your program of choice and manipulate in PS.
I think I'm just repeating the above though!!!
Some say start off in JPEG before moving to RAW file processing (particularly when learning), probably because the CR2 files are much larger and take a bit more computer grunt to manipulate - especially in large numbers...Like Wot We Astrophotographers Do!!!
You can "trial and error" ideas out more easily with the smaller JPEGs than you can with RAW files. When you have things sussed - RAW files will give you the maximum quality from your DSLR.
Good luck
Doug
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