don't they say that the image scale should be between 1 and 2 arcsec / pixel?
Image Scale = Pixel Size / Focal Length * 206
With 1900 mm focal length and 6.3 reducer you are roughly at 1200 mm focal length which requires 6 micron pixels to reach 1 arcsec per pixel...
I know that this is just theory and I am getting reasonable results with my C8 and 3.8 micron camera but I can see the difference when using a 6 micron camera and the 6.3 reducer.
This is M57 with C8 f/10 and ASI 224 camera:
looks more pixelated than this one, also C8 at f/6.3 with Atik Infinity
Edited by GazingOli, 05 August 2020 - 08:47 PM.