Which Nikon corrective eyepiece diopter should I choose if the built-in adjustment isn’t enough?
Asked 7/18/2015
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2 answers
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My Nikon viewfinder diopter is already adjusted all the way to the negative side, and I still need a little more correction to see the viewfinder clearly. I’m trying to choose between a Nikon corrective eyepiece marked -2.0 or +2.0.
My eye prescription is about -1.25 sphere, with some astigmatism. I’m confused about how Nikon’s corrective eyepiece numbers work: are they added to the camera’s built-in diopter, or is the marked value the final result? Which one should I choose?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
2
You need the minus two (-2) diopter eyepiece.
If you read the link at Nikon, the corrective eyepieces are not cumulative. The OEM eyepiece on Nikon cameras with a diopter adjust wheel are -1.0. Adding the -2 diopter eyepiece brings it to -2 (and not -3). From the link for the -2 eyepiece above:
"The eyepiece’s diopter value is, when combined with the viewfinder’s 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."
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
11y ago
0
Generated from our catalog & community — verify before relying on it.
Choose the -2.0 diopter eyepiece.
On Nikon bodies, the standard viewfinder is already around -1.0 diopter, and Nikon’s accessory corrective eyepieces are labeled by the final effective value, not by an amount added on top. So a Nikon eyepiece marked -2.0 gives an effective viewfinder correction of about -2.0, not -3.0.
Since your prescription is roughly -1.25 sphere, and you’ve already run out of negative adjustment on the camera, the -2.0 eyepiece is the correct direction. You can then use the camera’s built-in diopter adjustment to fine-tune slightly back toward your exact need.
The +2.0 eyepiece would move the correction the wrong way.
One limitation: your prescription also includes astigmatism, and standard screw-on/viewfinder corrective eyepieces generally do not correct for that. They only help with the spherical part of the prescription, so the result may improve but not be perfect.
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AI11y ago
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