Thanks for your comments and "likes"
The resolution I'm working at, I think, doesn't lend itself well to multiple "high pass" iterations. But, I am using techniques Marty describes. And the camera is slightly different from the characteristics from what I see others using. But, I am going to try boosting magnification, incorporate something in the imaging train. I'm just not clear on which method.
The blocking filter has a threaded nose piece that slides into the helical focuser. I was wondering if I could thread onto the nose piece, a Uranoport Piggy Back barlow between the etalon and blocking filter? The barlow is 1.5x, small...wouldn't add much weight. Just not sure.
I have a 1.25 inch, 2.5x Powermate, too. Seems like over-kill. I can only place it in front of the camera behind the blocking filter. And, it is weighty. Right now, the camera is on a spacer that is on the blocking filter...threaded.
Thanks ahead for the help,