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To determine which diopter is best for you, consult with your eye physician. Or, you can try a pair of over-the-counter correction lenses typically found in drugstores. Find a pair that permits you to see sharply at approximately 6.5' (2 meters), which resembles the range of a viewfinder. This will provide you a rough estimate as to which diopter is correct for you.
The ZI Diopter, -3 Correction Lens from Zeiss Ikon is for modern Zeiss rangefinder cameras and provides near or far-sighted users a clear viewfinder image without the use of eyeglasses. The diopter correction lens fits into the eyepiece holder of the camera.