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Gary, Leon is on the money. Sit tight for a while.
If you are looking at an 80mm refractor, then most, if not all, need some form of assistance to give a flat field. This is no biggie, and even the champagne units require them.
Suggest you see what others are using and replicate that. In my case I had a nice Lomo/TMB 80mm apo, and used the Baader MPCC. Now I have the FLT132 and it has a dedicated flattener, and it works, contrary to some of the other W/O flatteners.
Decided your budget, and go from there.
Gary
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