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Did some testing last night.
attached is 75mm from the flattener start of the male thread as per Manual.
it was pretty close but still not flat
I added a 5mm spacer to make it 80mm and it go worse.
So I am close at 75mm but I am right at the end of my back focus..even have to unscrew the focuser rotater to give me a few more mm to focus.?
Pics attached.
75mm spacing...its pretty close.
80mm spacing it gets worse.
75mm spacing top left corner
80mm spacing top left corner.
Either way I am using my full back focus.
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