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Correction eye pieces

Geoff Powell , Feb 16, 2010; 11:30 a.m.

I'm after correction eye pieces for an F/F3HP and FE. I'm farsighted and my prescription is +1. I've read in previous posts that the finder, minus eyepiece, has a diopter value of -1. So with this in mind I should need a +2 diopter, I think . However I've just had an email back from Nikon Europe telling me that I would need a diopter of +1 as the number on the diopters refers to the prescription. I'm now a bit confused. Can anybody clear up my confusion.
Thanks Geoff


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Howard M , Feb 16, 2010; 11:40 a.m.

Nikon is right; there is no confusion.

Geoff Powell , Feb 16, 2010; 11:49 a.m.

Howard thanks, but if that's the case why would a '0' Diopter correction eye piece be available for the FE?

Curt Wiler , Feb 16, 2010; 11:49 a.m.

Nikon has published a number of tables explaining this. An example is at: (link)
or for the entire system: http://www.nikonusa.com/fileuploads/pdfs/EP_CompChart.pdf
The most important thing, and where some confusion comes from, is the one-meter distance for the prescription. Read these instructions carefully (particularly the second one) and you will see the answer to your question.

Michael R. Freeman , Feb 16, 2010; 11:49 a.m.

The value on the correction eyepiece is the *combined* diopter of the correction lens plus the native viewfinder diopter value of -1m. That's why you can buy a 0 correction lens, but no -1 correction lens (they are available in -5, -4, -3, -2, 0, +0.5, +1, +2 and +3). The missing "-1 correction lens" is actually the flat glass standard eyepiece (no corrective value).

So a +1 Nikon correction lens is actually a native +2 diopters (+2-1=+1).

Not sure if that clears up the confusion. :-)

Geoff Powell , Feb 16, 2010; 12:37 p.m.

Curt,Michael, thanks for your responses. So I need a +1 diopter. I think!

Kelly Flanigan , Feb 16, 2010; 12:59 p.m.

Geoff; if your eyes naturally focus at objects 1 meter away; then you require no extra special eyepiece.

Is your " +1 prescription " to see distance; ie driving; ie the moon?

If so that means you use a +1 eyeglass prescription to see infinity; and a +2 eyeglass prescription to see objects at 1 meter. ( or a Nikon +1 eyepiece ).

If you go to a drugstore and pickup a cheap +2 reading (closeup) set of glasses for 5 to 10 bucks; you can place them on and see if the screen looks sharp.

Geoff Powell , Feb 16, 2010; 01:22 p.m.

Kelly, my prescription is for farsighted, ie closeup. (Their terminology isn't very logical!) Reading and up to around a meter. Infinity, they're fine. So a +1? Not sure if Nikon still stock these for the F's and I haven't seen any on eBay either.

Matthew Currie , Feb 16, 2010; 05:39 p.m.

My reading glasses prescription is +2, but a +1 diopter is still adequate on the F and F3, so you should be fine with +1 for a long while.

Geoff Powell , Feb 17, 2010; 03:08 a.m.

Matthew, that's good to know as they aren't as good as they were at the last test!

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