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Hi Ivan
I believe that the distance from the front objective to the FF/FR is your focus.
The distance from the FF/FR to the sensor is very important to get a very flat field. I have mine just running the normal spacing, 55mm I believe, and my field is pretty flat, maybe a tiny bit out but I haven't played to much yet as Im happy with the vast improvement over not having it. You can use delrin spacers to control the distance.
Paul, there is an adapter that screws into the 72ED drawer tube (after you take off the factory fitted compression ring) that allows the FF/FR to screw in, easy as pie. Not sure they are everywhere but I got mine in the package with the FF/FR.
With my setup, 72ed > FF/FR >DSLR, I still have about 3-4mm of inward focus but I haven't run into a situation where focus has been an issue.
Last edited by Icearcher; 10-04-2019 at 08:36 AM.
Reason: I thought the adapter was separate but it was in the 72ed FF/FR package.
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