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Hi Mike,
The Nikon F-mount has a flange to focal plane (sensor) distance or 46.5mm. If you add the 9mm of the OAG you get 55.5mm of back focus. Unfortunately this doesn't include the M48 t-ring that you will need to join these together (another 10mm approximately). In my opinion the Baader MPCC wont work with an OAG that thick on a DSLR. There are thinner ones that may get you closser. I am also unsure how much the extra 10mm will affect the MPCCs performance. Some coma correctors are very sensitive, others are not so. This is one of the reasons I purchased the Bintel / GSO Coma Corrector as it has a back focus of 75mm required. Enough to get all the right adapters between it and the mounting flange on the camera.
Anyone can correct me if I am wrong.
I hope that this Helps
Jimmy
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