I personaly use Imagesplus for stacking and calibrating and Photoshop CS is used as they say for making it look pretty.
When I did start I just used the free K3CCDtools version 1 for stacking all my DSO's..I just used the planetary wizard which worked fine for me.
I never had any luck with Iris....too techincal but it's free.
If you do want a program that is great with your 20DA then you cant go wrong with images plus....this program can also control your long exposures so it's a all in 1 that will do almost everything for you.
Even though I can do the same with Imagesplus I use DSLR focus to control all my long exposure for the reason being I know how it works and I like how it does the job.
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