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Hi Greg
Thanks for the pointers.
As you point out, it's a camera issue not an optics one. I find I can get around 6 minute subs using a canon with an LP filter and an f7.7 scope before it all goes pear shaped.
So the concern is that getting a very fast scope won't really be a great advantage, just pulling in Sky glow faster unless I am using a ha filter?
Objective is really trying to get a good range of focal lengths for imaging but based on DSLR ahead of going the ccd route. Currently referencing the kit used by Ian cooper on the " imaging the southern sky's" book as I try to figure this out.
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