Eyesight Correction eyepiece

[gwpics]

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I have acquired a Voigtlander +2 diopter eyesight correction 'disk' for my M240, which I believe will fit. This belief is based on the fact that I am told it fits the old film Nikon viewfinders, and from memory I believe the Nikon ones fit Leica. From memory I think I have to remove the original one and replace it. Can anybody confirm that:

1. I am correct; and

2. Is there an easy way to remove the original one short of taking a pair of pliers to it.

Thanks,

Gerry

[Pieter12]

Do not remove the original. Correction lenses are meant to screw into the existing eyepiece.

[lekitr]

I don't think it will fit.  Yes they are like the Nikon and even fit on some mf mama but not on the m.

I'm up to the +3 now and looking to have some lens made to replace the +3 in their mount.

Sometime I use the 1.4x from light lens lab and tape my old +2 over.  As the 1.4x includes a -2 to +2 adjustment I can push it to +4.

You have to buy the Leica diopter.  there is 2 type, I think you will need the old one for the m240.  I have the old type for my M-A. actually I have 2 old type.  I needed an adapter to use this on my M0-P which need the new type.  the adapter is pricy for what it is, a kind of washer with thread.  But for a few dollar more than the  price of the afore mentioned adapter I bought the 1.4x from LLL as it come with the necessary adapter.

Hope this can help.

[lekitr]

And by the way, the rf is actually already at -0,5 so you must add 0,5 if you're on the plus side so with +2 you actually get +1,5 net.

With -2 you end up with a total of -2,5.  

 

[gwpics]

hanks everybody, that has answered my question. I will give RobertWhites a ring and tell them the bad news (they did not say it would fit, they didn't know!).

Thanks again!

Gerry

[Luke_Miller]

I have a collection of Leica corrective diopter eyepieces.  I acquired it trying to find the one that worked for me.  I have excellent distance vision, but need correction for close up and reading. My reading prescription is +2.5, but the eyepiece diopter that works best is either +0.5 or + 1.0 (a +0.75 would be perfect).  Bottom line, there is little correlation with my eyeglass prescription and trial and error gets expensive.

Edited July 18 by Luke_Miller

[Jean-Michel]

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The simplest way to find the correct diopter, if you need one, is to visit your optometrist or optician and one of their test diopter against the eyepiece as you look through it with your normal eyeglasses. Then buy the correct Leica one. 

[jaapv]

On 7/18/2025 at 3:19 AM, lekitr said:

And by the way, the rf is actually already at -0,5 so you must add 0,5 if you're on the plus side so with +2 you actually get +1,5 net.

With -2 you end up with a total of -2,5.  

 

The viewfinder has a -0,5 diopter strength to optimise eye accommodation at 2 m which is the virtual distance of the framelines and focus patch. So it is a mistake to attempt to "correct" it. However if you alter the value of diopter the whole calculation shifts, making it the work of an expert to calculate the correct value. Simply adding and subtracting is a fail. Either use Jean-Michel’s trial and error method or use a real expert and have somebody like https://walterleica.com  make a dedicated diopter for you. He can also make diopters to correct astigmatism and contrast-enhancing ones. 

[lct]

22 hours ago, Jean-Michel said:

The simplest way to find the correct diopter, if you need one, is to visit your optometrist or optician and one of their test diopter against the eyepiece as you look through it with your normal eyeglasses. Then buy the correct Leica one. 

+1

[F-train]

My arms are also getting too short, +2.

I understand you can correct this for EVF and ground glass, but what is the result in an M finder? You see the patch sharp, but what about the picture?

 

(Sorry GWPics for hijacking your thread…)

Edited July 31 by F-train

[gwpics]

1 hour ago, F-train said:

My arms are also getting too short, +2.

I understand you can correct this for EVF and ground glass, but what is the result in an M finder? You see the patch sharp, but what about the picture?

 

(Sorry GWPics for hijacking your thread…)

I aam afraid I can’t help you because I did not get one.

Gerry

 

[Jean-Michel]

On 7/31/2025 at 12:54 PM, F-train said:

My arms are also getting too short, +2.

I understand you can correct this for EVF and ground glass, but what is the result in an M finder? You see the patch sharp, but what about the picture?

 

(Sorry GWPics for hijacking your thread…)

The EVF-2 for the M(240) has a built-in diopter adjustment. Just move it one way or the other. There is no ground glass, it is just an electronic viewer.

For the optical finder, best is to do as I wrote in post number 7.  The 'picture' and the rangefinder patch are at the same plane.