Photographic Field Flatteners
These new Stellarvue modular field flatteners will work with virtually every camera on the market by employing various adapters. Now you do not have to worry about getting different flatteners when you change cameras: you merely purchase  the correct adapters as needed.

Threaded adapters are a much better choice than plug in adapters which can sag. Threading all components of the optical train ensures the sharpest images consistently.