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Nikon -4 Diopter for FM3A, FM2, FM, FE2, FE & FA

B&H # NIDM4FM2 MFR # 2937
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You Pay: $14.99

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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 .


by PowerReviews
Nikon-4 Diopter for FM2/FE2/FA

(based on 2 reviews)

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Reviewed by 2 customers

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Lot of clarity in your Viewfinder

By Yves

from Raleigh, NC

About Me Casual Photographer

Verified Buyer


  • Durable
  • Easily Interchangeable
  • Lightweight
  • Strong Construction


    Best Uses

      Comments about Nikon -4 Diopter for FM2/FE2/FA:

      For those of us who are suffering from Myopea (the inability to see at long distances), this corrective eyepiece works perfectly. I mounted this part on an old FM body (suddenly, I am tired of all the electronic gizmos and fell like going back to the early days of photography)and it works wonder. The viewfinder is very clear and the focus of the lens is now a breeze. I did not give it 5 stars for one single reason: you cannot mount a rubber eyepiece on this corrective lens. Otherwise, the corrective eyepiece does not rub when you open the back and is very discrete and light.

      • Was this a gift?:
      • No

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      Good assistance

      By Alvera

      from Rep. of Georgia, Caucasus

      Verified Reviewer


      • Solid


        Best Uses

        • landscape
        • Studio

        Comments about Nikon -4 Diopter for FM2/FE2/FA:

        The quality is out of question.
        But, before baying it, you need to decide what is more uncomfortable for you – vie to the viewfinder through the glasses, or take out your glasses each time you are making a shoot. Besides, you need remove diopter each time, you are asking somebody to make picture of you. Personally, necessity to change angel of vie to see exposure meter and aperture values and, thus, loosing concentration on the subject of picture, was very irritating for me. So, I'm using it with FM3A, and happier now.

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