Re: [APML] NGC7822, Ced214, and Sh2-170

[Aplanatic@aol.com]

I wrote, in part:

> Your situation with the
> fast Schmidt camera is very different from Chuck's.

Chuck asks:

> What does the instrument have to do with 
> the color balance?

Not much.  My point was that Loke can easily achieve "sky fog limit" with his Schmidt whereas you would have a hard time doing so at f/8.  The definition of "sky fog limit" is rather nebulous and qualitative, at least from my perspective, but that wasn't my point.

I don't see why Loke can't make a decent stab at good color balance by exposing each channel for best S/N and then finding the correct scaling of these images to produce a good gray for a known target.   This is what you have done for exposure times.  I can't think of any reason why this would not work in a similar way for scaling.  

Dave Rowe



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