Brenton C Posted April 25, 2014 Share #1 Posted April 25, 2014 Advertisement (gone after registration) I s'pose if the local Leica store had a range to choose from, I could sample them to find what I need. Is there another way, such as from knowing the prescription strength of my specs? Quote Link to post Share on other sites More sharing options...
Advertisement Posted April 25, 2014 Posted April 25, 2014 Hi Brenton C, Take a look here Diopter value, how to know?. I'm sure you'll find what you were looking for!
dkCambridgeshire Posted April 25, 2014 Share #2 Posted April 25, 2014 I s'pose if the local Leica store had a range to choose from, I could sample them to find what I need. Is there another way, such as from knowing the prescription strength of my specs? If you have a prescription for distance specs that should translate to required diopter strength but not for any required astigmatism correction. dunk 2 Quote Link to post Share on other sites More sharing options...
bonatto Posted April 25, 2014 Share #3 Posted April 25, 2014 I had the same dilemma, in the end it was just easier to try a few out at the shop. I have about -1.5 on my right eye for specs, and lines/rf patch and image are all fuzzy. A -2.0 diopter took care of that, makes a world of difference. Expensive but worth it. Put it on, make sure it's tight, and forget about it. 1 Quote Link to post Share on other sites More sharing options...
Orient XI Posted May 8, 2014 Share #4 Posted May 8, 2014 If you have a prescription for distance specs that should translate to required diopter strength but not for any required astigmatism correction. dunk My optometrist informs me that an astigmatism correction lens for the viewfinder is useless. When correctly set for horizontal photographs turning the camera to the vertical position changes the horizontal correction to the vertical correction and vice versa. Essentially the distorted eyeball needs one correction lens curvature in one plane and a second curvature in the plane at 90° to the first. Switching the corrections can only make things worse! Quote Link to post Share on other sites More sharing options...
dkCambridgeshire Posted May 8, 2014 Share #5 Posted May 8, 2014 My optometrist informs me that an astigmatism correction lens for the viewfinder is useless. When correctly set for horizontal photographs turning the camera to the vertical position changes the horizontal correction to the vertical correction and vice versa. Essentially the distorted eyeball needs one correction lens curvature in one plane and a second curvature in the plane at 90° to the first. Switching the corrections can only make things worse! It's "useless" for one plane but most photographers use their cameras in landscape format most of the time … so it's not 100% useless. Astigmatism can be corrected via eye exercises - ask your optometrist. dunk Quote Link to post Share on other sites More sharing options...
tobey bilek Posted May 10, 2014 Share #6 Posted May 10, 2014 Ask your provider what your proper spherical correction would be for 2 feet in the eye you will use. This means you will take off your glasses and lose any cylindrical correction you might have for astigmatism . If you wish to leave glasses on, +1 should work. Fall back is to go try various reader glasses at drug store and buy the same diopter. Quote Link to post Share on other sites More sharing options...
jaapv Posted May 10, 2014 Share #7 Posted May 10, 2014 (edited) Advertisement (gone after registration) That problem has long be solved: Walter RX Leica M rangefinder astigmatism rotating eyepiece | Leica M9 M9-P astigmatism rotating eyepiece diopter correction lens, fits rangefinder M8 digital M7 M6 M5 M4 M3 M2 leitz analog cameras. My optometrist informs me that an astigmatism correction lens for the viewfinder is useless. When correctly set for horizontal photographs turning the camera to the vertical position changes the horizontal correction to the vertical correction and vice versa. Essentially the distorted eyeball needs one correction lens curvature in one plane and a second curvature in the plane at 90° to the first. Switching the corrections can only make things worse! Edited May 10, 2014 by jaapv Quote Link to post Share on other sites More sharing options...
jaapv Posted May 10, 2014 Share #8 Posted May 10, 2014 I s'pose if the local Leica store had a range to choose from, I could sample them to find what I need. Is there another way, such as from knowing the prescription strength of my specs? http://www.l-camera-forum.com/leica-forum/leica-m-type-240/308500-leica-m8-m8-2-m9-m9p.html#post2554274 1 Quote Link to post Share on other sites More sharing options...
jaapv Posted May 10, 2014 Share #9 Posted May 10, 2014 Or, of course: Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! :D 1 Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! :D ' data-webShareUrl='https://www.l-camera-forum.com/topic/225929-diopter-value-how-to-know/?do=findComment&comment=2587515'>More sharing options...
Jeff S Posted May 10, 2014 Share #10 Posted May 10, 2014 That problem has long be solved:Walter RX Leica M rangefinder astigmatism rotating eyepiece | Leica M9 M9-P astigmatism rotating eyepiece diopter correction lens, fits rangefinder M8 digital M7 M6 M5 M4 M3 M2 leitz analog cameras. I thought so as well, but this recent post raises doubts about its practical use. Regardless, I stick to my prescription glasses…corrects for VF as well as for looking at the subject at a distance, without having to continually put on and remove glasses. And given my sensitivity to sunlight, prescription sunglasses solve another simultaneous issue. Jeff 1 Quote Link to post Share on other sites More sharing options...
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