[Striker (Tony)]

HI guys,

I am loving this scope as an upgrade from the ED80 but I cant seem to get a flat field even using the flattener.

As per the manual it says 75mm but the manual shows different spots to measure the 75mm from.

I have it 75mm from the start of the male thread on the field flattener but still get a little curvature with the ASI1600 which is tiny compared to a full frame circle flat field is suppose to have.

Also I am max extention on the focuser..even have to unscrew the rotater thread out a little to give me a few more mm for focus.

Wondering how others have theres set up, any help appreciated.