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Troy,
I have a TMB92ss and have been using the Astro-Tech field flattener recommended by Astronomics. I have found that it does the job nicely.
Due to the recent inclusion of an OAG in my imaging train, the Astro-Tech is no longer suitable as the OAG adds too much back focus for it.
Annoyingly, I can't put the OAG before the flattener (relative to the focuser) because the flattener's nosepiece is not removerable!
I am therefore considering purchasing the WO FF4 as it allows for considerably longer backfocus.
How have you experiences been with the TMB and WO FF4? Does the flattener perform well with the scope?
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