From Roger Samworth
At the meeting last night it the new Sodium-line filter/eyepiece from Daystar was mentioned. Pete (I think) said the view was a combination of Ha and white-light.
Hmmm – – – -!
Just for fun, I got hold of the 2 window-sill images, White light and Ha, that were shown at the meeting, aligned them a bit better and merged them in GIMP. I added a little limb-darkening compensation, and the result is attached, together with the 2 originals for comparison.