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As you say Mike it is each to their own. Everyone is going to have their personal boundary. Sorry if I opened a can of worms. I just wanted to voice my opinion on these sort of shots. People often think I use tracking on my nightsky scape work. The real benefit of doing shots in this way is noise control. Instead of 2 minutes at ISO 3200 for each shot, you could do shots for 16 minutes at ISO 400 for exactly the same result but with significantly less noise.
Greg B.- For me, Deep Space images are not composites in the sense I was talking about because you are stacking/adding frames of the same object (just different filters and exposure lengths sometimes). If however someone blended a shot of the Horsehead Nebula with a widefield shot of Eta Carina, that would cross my line. Now that is an extreme example in terms of Deep Space photography and I'm sure no one would ever do it but I have seen plenty of examples of that sort of thing with landscape astrophotography.
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