star adventurer 2i pro
I had to use 2 second length exposures just to get round-ish stars. They are still slightly eggshaped. I can't decrease the exposure enough to get completely sharp stars. without having to take exponentially more and more very short exposure photos.
the periodic error could only be fixed with a periodic error correction curve applied with a guidescope. and even then its so jerky and unstable it still might have issues!
I found an easy-ish eay to attach the ST80 lens cell directly onto the end of the telescope tube of my SV503 70mm F6 ED telescope tube barrel with the 70mm lens cell unscrewed.
although judging by the stars on the left side of the image being a little more bloated looking. I think there may be some tilt or
coma that I don't quite see. probably more likely tilt in some way. I'm not sure where its coming from. rotating the lens around doesnt seem to really change the direction. so its possible I have some sensor tilt or something else is not sitting right
Heres an example. Take a look across the frame. (Single frame of a comet. 5 seconds exposure length iso 800)
If I use my regular non-reducing flattener I can get razor pin-prick point sharp stars from the center to the edges. So its possible the way I'm using the reducer is causing tilt. or the way I have it attached or something.
