roger_bergeron

This msg is late to the party, but this question may haunt those hobbyists who treasure legacy film Nikon cameras…. Nikon has a publication which speaks direct to the Nikon-specific camera diopter situation, named “Nikon SLR Camera Viewfinder Eyepiece Application Reference” (I am looking at version revision which was updated on September 17, 2004” It is true that Nikon SLR cameras (without a built-in adjustable eyepiece correction have a base diopter value of minus one. A clear eyepiece will result in a minus 1. If you replace the clear eyepiece with a plus 3, the end result is a plus three… (the base -1 is taken into account in labeling the replacement eyepieces)… no math required) Nikon publication also states: To determine which Nikon diopter is best for you, see an ophthalmologist, optometrist, or a dispensing optician. Ask them to determine your specific diopter, based on your corrective prescription when viewing an object at a distance of approximately 1 meter. Then base your Nikon diopter purchase on this diopter value. End.