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Fov and tunneling calcuation formula

Hoody2shoes

Sergeant of the Hide
Full Member
Minuteman
May 10, 2020
321
348
I cannot find the formula for calculating tunneling for the life of me. I know I've seen it before-can someone post it up please?

Edit***
Is it
Max fov/min=x
Erector/x=y
Y*base mag=min mag where tunneling begins?
 
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