Based on advice from Mark, and seeing there was a short stint of sunshine this morning, I quickly tried 3 different apertures - the native 102mm of the ST102 (so f5), and then 80mm (equiv f6.3), and then 60mm (equiv f8.3). Exact same number of exposures, same % stacked, same ImPPG curve, same GIMP curves. There will be some seeing difference but it wasn't that variable over the 3-4 minutes. The aperture step down makes such a difference - thanks Mark!
I think the 60mm is sharpest at Gband, but the 80mm doesn't seem that far away from it?
102mm
80mm
60mm
ROI at bin1
Same ROI at bin2 w a 2.5x powermate - I actually should have stuck to bin1 as per Marty's spreadsheet
I tried the aperture step down for 540nm continuum as well. Not as much of a difference as in Gband, although the 80mm is still better than the 102mm?
102mm
80mm
60mm
