Nice test David - very interesting in deed.
I have the WO Megrez 90 and have looked at the MPCC and Televue for flattening the field for imaging. The Televue in your tests speaks for its self but with a focal length of 621 for the Megrez 90 it sits just out side of the optimum range, 400 - 600mm, as you detail. I am also considering the new HOTECH flattener (not a reducer though), which has an extended focal length range.
Interesting to note the weight of the Televue and of course that it's considerably more expensive.
Nice comparison David.
Cheers, nix
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