Hi, I have my 200mm reflector, tracking motor & precision gear, Nikon D80 DSLR, T-ring to fit DSLR to telescope, Laptop computer. I have no idea what software I need or where to get it. Preferably a free download would be good. I assume stacking images is apart of the software. I'm sorry if i'm asking something that's been discussed before. I love the results you all are getting & want to do this as well.