[Rerouter (Ryan)]

I've not yet had a good enough imaging night to really test it out, but my first few runs have shown a reduction in coma, but a decent increase in the curvature,

Reading around these coma correctors seem to prefer a slight increase in distance over the quoted 55mm, I'm curious if anyone has shimmed theres and can give some ideas on how far you had to shim it to resolve the error.

What I have managed to dig up so far in various threads across the internet, with 8" and larger being calculated by someone simulating the mirror conic, is the following rough outline, which to me implies its more to do with the F stop than the size of the scope.

5" F/5 = >0.6-1.4mm added
6" F/5 = >1mm added
6" F/6 = 2.5-3mm added
8" F/5 = 3mm added
8" F/4 = 3.2mm added
8" F/3.69 = 3.5mm added
10" F/3.55 = 4mm added

spacing too little = star shapes point away from center
spacing too far = star shapes point perpendicular to center