I have a Skywatcher ED80 and have been given an Orion field flattener to try before I buy it.
However it seems to be an older model without the M54 and M48 adapter.
I tried to get an answer from the manufacturer but they referred me to this forum.
The situation is as follows.
My camera is the QHY268M and comes with M54 and M48 threaded end spacers.
However the M54 doesn't screw on the male thread of the Orion field flattener.
So I asked the manufacturer what thread size it was but no luck.
I think it is M56 x 0.75 which seems an odd size.
Can someone confirms this?
How are others using this field flattener with their equipment?
I have attached a picture showing the thread.