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Nice detail Doug, bit of a stock answer, but it's true.
Re the use of ha as a luminence, I see Richards point BUT, I question the following, in particular as I use a one shot color camera
1. If the object is purely ha such as cats paw it's not going to make any difference.
2. In an object such as m16 which I presume to be largely ha in the nebulosity, what is the ratio of say ha to sulfur or other band in a luminosity way, in a one shot color the ha pretty much dominates anyway so is the difference really minimal.
3. People are happy to use non modded cameras to image m17 which makes a substantial difference to the image, and they are happy enough.
4. Given the ha makes the stars much smaller in respect to the nebulosity ( hope that makes sense) I think it's worth it to reveal that extra detail.
5. Any narrowband image is already fiddling with whats there, this is just another way of fiddling with it.
Imaging is really art in a way, one mans Picasso is another mans Rembrandt, and whilst Richards point is true, I feel that all imaging processing accentuates one aspect and limits another. So it's really an argument left to personal preference.
Clive
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