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Set of four Schneider 138mm full diopters for reducing the minimum focus distance of a lens: +1/2, +1, +2 and +3.
To roughly calculate the minimum focal distance when used with a diopter you can use the following formula:
MFD / (MFD * D + 1)
MFD = Minimum focal distance (in meters) D = Diopter Strength
This formula will only give you an approximate value.
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