[Asa 3" 0.73x corrector]

as you can see, the measure of diameter on the pdf is 79.5mm while in reality it is 81mm

[Asa 3" 0.73x corrector]

Goodevening.

I'm italian guy, i buoght a 3" 0.73x corrector used from a austrian guy. while I was taking the measurements to make the fittings I realized that they were different from the specifications.  I have attached photos of the corrector and the pdf with the specifications of the corrector ... even the real length of the corrector is different!  have different models been made?  Thanks for your help.  Giovanni.Corr_3Zoll_Reducer.pdf