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Mamiya Eye Correction Lens DE403 is designed to provide clear viewing of the viewfinder image for farsighted vision. Its diopter adjustment ranges from 0 to -3. Mamiya 645 AF built-in diopter adjustment ranges from -2.5 to +.5. The DE403 is one of three additional interchangeable diopters to provided increased diopter adjustments for Mamiya 645 AF.