Optional Nikon eyepiece diopters allow you to optimize your SLR viewfinder's sharpness in conjunction with your individual eyesight. Nikon SLR cameras (without built-in adjustable eyepiece correction) have a base diopter value of minus one. Minus one is considered the optimum starting point for the majority of SLR users with normal vision. The combination of the camera's viewfinder components and a clear (standard) eyepiece form a virtual image of a subject on the camera's focusing screen that is the approximate equivalent of a viewing distance of one meter.
Each Nikon eyepiece diopter incorporates a numerical value, represented by a minus value (nearsighted) or a plus value (farsighted) number, enabling you to select the appropriate diopter for your vision and your camera model.
The eyepiece's diopter value is, when combined with the viewfinders minus one value, the end-result value. No combination of the camera's base value of minus one and a given accessory diopter's value is required to arrive at the final desired value. In other words, if you require a diopter of plus 3, simply add a plus 3 diopter to your camera.
Please click here for a Compatibility Chart .
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Comments about Nikon +2 Diopter for FM2/FE2/FA:
I needed a diopter for my Fujifilm GF670, and after reading somewhere in the internet that these Nikon diopters were compatible with my camera, I ordered one. It does fit perfectly and it works as expected, highly recommended. It also fits my Nikon FM3A, of course.
Pros
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Comments about Nikon +2 Diopter for FM2/FE2/FA:
The Nikon '+2 Diopter' I bought from B&H is OK but not as sharp, or as correct, as my Leica +2 diopter. My Leica +2 diopter fully corrects my vision and gives a sharp, clean image. The Nikon diopter (which is rated as being the exact same strength - i.e., "+2") is not very sharp and seems to be off by about 10% -25%. So, in other words, I have to focus the lens (manual focus) back and forth until I get it at its sharpest point - but never actually sharp. The Leica diopter I use on my M6 gives me exact sharpness, so I can actually see when its perfectly focused - no back and forth guesswork. But, still, I can see significantly better with the Nikon diopter than without it.
Comments about Nikon +2 Diopter for FM2/FE2/FA:
Using on a Fuji GSW690III. Very good quality.
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