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The flattener is right and it looks like the DSLR adapter is there - there looks to be a bit extra on yours after the adapter though which might be taking the backfocus back too far. I have a canon t ring with mine and it looks thinner but not sure if the Nikon one is different. The ring screws straight onto the adapter with no extension tube. The other thing - is it the correct flattener for the 80 mm. I know some inadvertently got the wrong flattener. On the flattener mine has 120 - might be worth checking as this can cause issues.
Brian
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