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You could easy calculate the maximum focus distance.
1 diopter is a 1 meter focal length.
When you set your focus distance on the lens at infinity an add a 1 dioter, then your far focus distance is set at 1 meter.
with diopter 2 is a 0,5 meter
with diopter 3 is a 0.33 meter
Formula is 1m/d=far distance (m)
Near focal length is more difficult to calculate.