This is my 2nd year of observing and my first full summer of imaging (read: virtually the only season for imaging in cloudy PNW!) and after absorbing and lurking to optimize my setup and workflow, I've now started getting images I'm satisfied with. I've got:
1) Jupiter with Io on 8-29-22 at 0742.8 UTC, with 9100 frames manually tracked on my 8" dob with 28% stacked in AS!3, and
2) Jupiter on morning post-opposition on 9-27-22 at 1003.6 UTC, using an 8-image derotation in WINJUPOS, each image comprised of 9000-15000 frames tracked with my 8" dob over 18 mins on a DIY EQ mount I constructed for the express purpose of making in time for the Jupiter opposition (troubleshooting delays notwithstanding).
I am nursing a Captain Ahab-level obsession with maximizing the potential of my modest-budgeted setup (signature contains details), and will be attempting to improve the following: better collimation, improve friction dynamics of gearing on my EQ mount (it only tracks for 5-10 minutes reliably with planet reasonably stable on ASI462 sensor/ROI in Firecapture), and look into coma correction.
Coma correction as relevant to the coma-free field of view in my setup is what I'm desperate to get some insight on as I am close being completely ignorant. My understanding from searches in this fantastic community is that in visual observing, the coma-free field of view in diameter is ~ 0.022*(f ratio)^3. In my case, that would be 0.022*(6)^3 = 4.752 mm. Since my sensor size in the ASI462MC is 5.6mmx3.2mm, with diagonal of 6.45mm, that would imply the planet target could have coma introduced if it leaves the central ~70% of my sensor area.
if my setup has me imaging at f/14.75 (2.5x barlow), does the coma-free field of view blow up to 0.022(14.75)^3 = 70.6 mm? And therefore there is no risk, even in totally manual tracking situations, of encountering coma? I would like to completely eliminate coma as a risk to image smearing/blurring. Thanks for any insight...