Which correction eye piece for a 0,75 astigmat right eye?

[MyLeicaWorld]

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As the title says my right eye which I use to focus is 0,75 astigmat. Which Leica correction eye piece should I get for my m10? Leica says the default eye piece is -0,50 diopter by default so +1.5 diopter eye piece will do the job for me. What do you think, am I right?

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[Good To Be Retired]

 

Search the forum, there is a fairly extensive debate, and a lot of disagreement, regarding the issue.

For me, I finally resorted to trial and error.  Mostly error

Edited December 11, 2020 by Good To Be Retired

[LBJ2]

If you have a local shop allowing customers during Covid-19 restrictions, the best approach seems to be to go to the shop and try the different diopters for yourself. I went through this process by mail order,  but in the end decided to use my own specs instead. Seems my eyelash smudges and smears the diopter piece itself so I can’t get critical focus through the smudged diopter even with the correct diopter. Ha ! Worse, the small diameter of the diopter is not easy to clean while out and about. 

[Peter Zapp]

Use no correction lens or wear glasses.

To correct astigmatism you need cylindrical lenses rather than spherical lenses. Leica only offers spherical correction lenses, You could get a custom correction lens from your optician. But if you then rotate camera and eyepiece by 90° for portrait shots, the astigmatism doubles (your eye's astigmatism plus the correction lenses' astigmatism on top). Likely still good enough for framing, but no longer good enough for focussing. You would need a rotating eyepiece with correction lens that horizontally levels with your eye. The M10 finder has a longer eye relief than previous digital and film Leicas, therefore is better compatible with glasses than ever.

After my laser surgery I have a residual -1.0dpt cylinder and +0.25dpt spherical on both eyes. My vision without glasses is above 80% and on par with my vision before with glasses (-5dpt cyl, +2dpt sph!). I wear glasses when driving, but not when using my Leica. 

 

[jaapv]

To correct astigmatism you need a  swiveling diopter by WalterX.

https://walterleica.com

 

Or just wear your glasses (the ones that let you focus from 2 m to approx. infinity.)

[Jeff S]

I wear glasses to correct for both astigmatism and distance.  These allow me to see the focus patch (set to a virtual distance of 2m on the M) as well as distant objects. As my eyes have aged, I now benefit from the addition of. +.5 diopter (still wearing glasses) to optimize focusing.  
 

I prefer this to a Walter eyepiece, as I want to be able to see clearly even when my eye isn’t pressed to the VF.  The VF for the M10 has a larger opening than prior models, along with increased magnification and better eye relief for eyeglass users. Be sure to get diopters, if needed, specifically for the M10.  
 

We’re each different, with different eye conditions and different viewing preferences and comfort levels. 
 

Jeff

[plasticman]

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2 hours ago, jaapv said:

To correct astigmatism you need a  swiveling diopter by WalterX.

https://walterleica.com

I appreciate these are handcrafted and most probably excellent quality, but that's an eye-wateringly high price. 😰 

Maybe this is me being a hypocrite though - I often say I'm willing to pay more for locally made and high-quality products, but I think I'd have to think twice about a tiny diopter that cost almost 450 dollars.

I like that a lot of cameras these days include a diopter (and I know there are some people who don't think one is necessary or even desirable in a Leica rangefinder).

[Jean-Michel]

I wear glasses – all the time – and found that a diopter was very helpful. In order to make sure if i needed one and which one i should get,I went to my regular optician and simply held a series of his test diopters between my glasses and the camera eyepiece. That convinced me of the need to use a diopter and which one I needed.

[jaapv]

27 minutes ago, Jean-Michel said:

I wear glasses – all the time – and found that a diopter was very helpful. In order to make sure if i needed one and which one i should get,I went to my regular optician and simply held a series of his test diopters between my glasses and the camera eyepiece. That convinced me of the need to use a diopter and which one I needed.

That is the way to do it, but astgmatism complicates matters. see post #4

[jaapv]

43 minutes ago, plasticman said:

I appreciate these are handcrafted and most probably excellent quality, but that's an eye-wateringly high price. 😰

Are you sure that you are a Leica user AKA buyer? As I understand it the whole point is that this thing stops your eye from watering when focusing

[Jeff S]

8 hours ago, Jean-Michel said:

I wear glasses – all the time – and found that a diopter was very helpful. In order to make sure if i needed one and which one i should get,I went to my regular optician and simply held a series of his test diopters between my glasses and the camera eyepiece. That convinced me of the need to use a diopter and which one I needed.

Same process for me.

Jeff

[PCPix]

Leica used to make ‘empty’ diopters (for the smaller/older M eyepiece) so you could have your own exact prescription made (especially useful for astigmatism). I had one but the issue was having to rotate the diopter when you went from landscape to portrait as you get ‘double blur’ if not. 

Cures: Wear glasses and no diopter on the camera or use the other eye if it has less astigmatism (not quite as difficult as you might imagine - took me a week to get used to it and that was 25 years ago;-)