Stacking RAW images in IRIS
Firstly, many thanks to all who replied to my previous posting about the bias frames.
I have two further questions about IRIS.
(1) On my Canon 50D DSLR, it is possible to reduce noise reduction for long exposure photographs. I heard somewhere that this involves the camera substracting a dark frame automatically, to reduce noise with 'bulb' exposures. Does this mean that beginners could possibly skip the dark frame step? Comments welcome.
(2) I wonder how you stack and align images in IRIS. I took 5 RAW images of beta Lyr last night. How do I stack and align these images in IRIS (can't find the help file).
Many thanks in advance
Chris Allen / Sweden