Im not sure if its an improvement but it sure has alot more back focus!
instead of the collar back to chip being 55mm i think they move out to 110mm but the trade off is the RCC1 is a whole lot bigger!
The wynne corrector would be the ducks perverbial when it comes to newt correctors for AP though.
91.5mm not 110. Do you need the extra 35mm of back focus?