Jeff S Posted February 18, 2023 Share #21 Posted February 18, 2023 Advertisement (gone after registration) Agree with everything Jaap wrote before I could. My 1.25 magnifier has stayed in a drawer for over 10 years. Trust your eyes, not the mathematics. If still fuzzy, be sure that you have corrected for any astigmatism. For decades I was fine just using glasses to correct for astigmatism and distance (and sun glare); only recently having to add a diopter for minor correction due to aging eyes. Jeff 1 Quote Link to post Share on other sites More sharing options...
Advertisement Posted February 18, 2023 Posted February 18, 2023 Hi Jeff S, Take a look here About the -0.5 diopter of the M11 viewfinder. I'm sure you'll find what you were looking for!
Besprosvet Posted February 19, 2023 Share #22 Posted February 19, 2023 20 hours ago, Jeff S said: Agree with everything Jaap wrote before I could. My 1.25 magnifier has stayed in a drawer for over 10 years. Trust your eyes, not the mathematics. If still fuzzy, be sure that you have corrected for any astigmatism. For decades I was fine just using glasses to correct for astigmatism and distance (and sun glare); only recently having to add a diopter for minor correction due to aging eyes. Jeff Only with -0,5 was still (slightly) fuzzy, with -1 looked perfect. Unexpected since my right eye is -0,4ish Quote Link to post Share on other sites More sharing options...
jaapv Posted February 20, 2023 Share #23 Posted February 20, 2023 12 hours ago, Besprosvet said: Only with -0,5 was still (slightly) fuzzy, with -1 looked perfect. Unexpected since my right eye is -0,4ish It all depends on the accommodation flexibility of your eye. Mild normally irrelevant astigmatism may also influence the result. A variation of 0.5 is quite normal, reason we advise to try it out instead of following your prescription. 1 Quote Link to post Share on other sites More sharing options...
jk356 Posted April 6 Share #24 Posted April 6 (edited) just to clarify is the Leica viewfinder lens a +0.50. that makes sense to ensure that 2m is in focus. This means that a -0.50 over the viewfinder will neutralize this distance and make the viewfinder focus at infinity. For instance -if the viewfinder was set at infinity, you would need a +0.50 is focus a 2m. consider an eye that has no accommodation (cannot focus from infinity to near, such as a person over the age of 65 that needs reading glasses for near vision. this person will need +0.50 to see clearly at 2m. If a person is near sighted and their spectacle correction is -2.00, they will need a -1.50 [-2.00 +(+.50)} Leica correcting viewfinder lens to see the focus patch clearly. if a person is farsighted and has a correction of +2.00, they will need +2.50 [+2.00 +(+.50)] . for the focus patch to be clear if the person can accommodate under age 40, use the nearest distance correction for the Leica viewfinder lens and they will be able to accomadate the +0.50 to make the focus patch clear Edited April 6 by jk356 correction Quote Link to post Share on other sites More sharing options...
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