Ive utilized the DUO with the SHarpstar 61 EDPH II and the RC8 , both at native and .67 reduced focal lengths. I have a Hyperstar C8 but haven't used the Duo on it yet. and I am using the AM5 with the ASIair plus.
My impression is that the wonky star shapes don't pose a large problem at short FL, although my guiding numbers are significantly worse than utilizing a 50mm guide scope and 290MM mini, the images at short FL don't seem to suffer because the arcsec/pp is larger than the RMS error.
But once that dynamic changes obviously it's a waste of time. I have spent several nights trying to tame the guiding specifically the RA, to no avail. I have adjusted the Max pulse from 1-10k and stepped through every aggression percentage, at .2 to 5sec guide exposures in Bin 1 and 2 with the dark library and without. There was no difference in the RA and overall guiding at any configuration. Generally the RMS at 1000-1600FL is .7-3+. with the bulk of time spent in the 1.5+ area. The time it dips below 1 is short-lived, like 20 seconds or so. And so I've come to believe, correct me if there is something I have adjusted or considered, is that the wonky star shape has dispersed centroids which causes the the guiding to chase the movement of 3~ centroids that each vary in intensity per frame. So depending on which centroid it is utilizing the RMS swing can suffer.
My impression is that the wonky star shapes don't pose a large problem at short FL, although my guiding numbers are significantly worse than utilizing a 50mm guide scope and 290MM mini, the images at short FL don't seem to suffer because the arcsec/pp is larger than the RMS error.
But once that dynamic changes obviously it's a waste of time. I have spent several nights trying to tame the guiding specifically the RA, to no avail. I have adjusted the Max pulse from 1-10k and stepped through every aggression percentage, at .2 to 5sec guide exposures in Bin 1 and 2 with the dark library and without. There was no difference in the RA and overall guiding at any configuration. Generally the RMS at 1000-1600FL is .7-3+. with the bulk of time spent in the 1.5+ area. The time it dips below 1 is short-lived, like 20 seconds or so. And so I've come to believe, correct me if there is something I have adjusted or considered, is that the wonky star shape has dispersed centroids which causes the the guiding to chase the movement of 3~ centroids that each vary in intensity per frame. So depending on which centroid it is utilizing the RMS swing can suffer.
