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(Obj diameter/2)-((obj diameter-tube diameter)/2)+lens cap thickness + cant
(56/2) + ((56-34)/2)+3
28+11+3= 42 mm or 1.65 inches
you can honestly disregard the cant addition If you want but this gets you in the ballpark. The cant is there for for full pic rail calculations. If your rail is only over the receiver then you can usually disregard it. That changes it to around 1.5 inches which is very typical for a 56mm objective