In order to obtain recommended (by Bintel) 85 mm distance from FF to sensor (with Canon camera) I need to machine 27 mm long spacer, with 2"-24 and M42 threads, to fit it to FF/FR on scope side and M42x1 for M42x14 mm spacer + M42 EOS adapter.
Or, I need
this adapter from ebay (bought it just now), plus some M42 extenders...