Leica Correction lens

[SudaliuS]

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Hello everyone!

May be someone will help me to choose correct Correction lens.
This is my story. I'm wearing a glasses with to lenses: astigmatic and -0.5. When I look into M11 viewfinder(it has -0.5 already) I see everything better. No questions. But if I wear off my glasses and look into viewfinder, I see even worse. Subjects are far from me.
Winter is coming and I planed to buy -0.5 correction lens to make shots on the street without glasses. But now I think it will not help, and maybe I need +0.5 or even +1.5 for subjects will be closer to me? Or nothing will help because I have an astigmatism?

[Jean-Michel]

Hi,

I wear glasses. There are a few threads on the forum with diopter calculations and such, but the easiest and most useful method is to simply visit your optician or optometrist and hold one of heir diopter test lenses over your viewfinder and see which one is best for you. Then buy the the one you need one from Leica. 

 

[TomB_tx]

I've seen several questions from people who wear glasses, but want to use their Leica without glasses. I wore glasses full time for 62 years and never took them off to use any of my cameras, and had no problems seeing the VF with a Leica. (Early Canon RF with tiny peephole VF was an issue.) However, I had strong astigmatism so a simple diopter wouldn't have helped anyway. It still seems unusual to me to remove glasses in order to use a camera. End of rant...

[wizard]

vor einer Stunde schrieb SudaliuS:

I'm wearing a glasses with to lenses: astigmatic and -0.5.

I had astigmatism for a long time, too (it went away once I got older, go figure). A screw-in correction lens will not be able to correct for astigmatism, only for minus or plus diopters, as astigmatism is angle dependent, so would need to exactly know the angle position of the screw-in correction lens when fully screwed-in (and an optician could then prepare an appropriate astigmatism correction lens and fit it into an empty correction lens holder in the correct position). Usually, however, astigmatism correction is not necessary when looking through a camera's viewfinder. Rather, plus or minus diopter correction will normally do the job. 

To find out which diopter correction lens you need, go to an optician and test it out. He/she will have -0.5, -1, -2 and +0.5, +1 etc. correction lenses in the shop which you can hold between your eye and your camera's viewfinder to check which one suits you best. Then order the proper Leica screw-in correction lens for your viewfinder.

As a final remark, I wear glasses, too, and contrary to Tom above, I have always disliked looking through my camera's viewfinder with my glasses on, so I can fully understand you.

[Jean-Michel]

As Tom_tx mentions, I cannot possibly think of removing my glasses when photographing, or at any other time! For decades I managed to simply view all sorts of 'viewfinders' on all sorts of cameras. I did prefer using a 'goggled' 35 Summicron on my M's simply because seeing the 35 frame was a bit difficult with glasses on. It is only since I got an M9 the an M-P(240) that I found a tiny bit of blurriness when looking through the eyepiece, so I did see my optometrist and held diopters over the eyepiece and found that, in my particular case , a +0.5 diopter helped clear the view. Interestingly, with my SL2, I am happy with the diopter adjustment set at zero.

[Luke_Miller]

As Wizard and other have posted "To find out which correction diopter lens you need, go to an optician and test it out". In my case I find there is little correlation between my eyeglass prescription and the correction diopter lens I need to focus accurately.  Guessing which one will work can result in acquiring an expensinve collection of corrective dioptrer lenses. Ask me how I know. 😒 

Edited November 22, 2024 by Luke_Miller

[RMF]

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@SudaliuS WalterLeica can build a custom diopter that corrects for both astigmatism and strength. Just need to send/email him your prescription. The diopter he builds rotates for vertical/horizontal use. Mine took about two weeks to arrive.  https://walterleica.com.