tdtaylor Posted March 3, 2011 Share #1 Posted March 3, 2011 Advertisement (gone after registration) My corrective lens on the camera has evidently taken a vacation to an unknown location. So I need to order another (plus my right eye has improved over the year). Just looking for confirmation. The Doctor told me my right eye was -1, -1 at 1 meter (I believe meter), but he really didn't understand the issue with the camera and how they classified corrective optics. He said the -1 twice. (Use to be -1.5). Since the viewfinder is set at -0.5, I believe I need a -0.5 corrective lens. Unfortunately I do not have anywhere locally to try them out, so it will have to be ordered. I do wear progressive bifocals, but I don't think this affects anything. Thanks in advance for advice. When I get the answer I think I will print it out and keep it in my eye file for the next one that takes a hiatus. Link to post Share on other sites More sharing options...
Advertisement Posted March 3, 2011 Posted March 3, 2011 Hi tdtaylor, Take a look here Diopter Assistance. I'm sure you'll find what you were looking for!
01af Posted March 3, 2011 Share #2 Posted March 3, 2011 Oh no, not again ... Link to post Share on other sites More sharing options...
tdtaylor Posted March 3, 2011 Author Share #3 Posted March 3, 2011 Oh no, not again ... Yes. And a search further confused me- several threads were rather contradictory. Hopefully this is a 2 response posting, to then gently fade down the page.... Unfortunately I took a bunch of shots this morning, thought my eye was sore from allergies. Abnormally many of the 50lux shots were just off focus. Ended up the corrective lens was missing and I was squinting. Link to post Share on other sites More sharing options...
tdtaylor Posted March 3, 2011 Author Share #4 Posted March 3, 2011 01af- Now that I think about it, you were one of the one's taking a different point of view in one of the previous threads. HOpefully we won't go back there. Link to post Share on other sites More sharing options...
jaapv Posted March 3, 2011 Share #5 Posted March 3, 2011 Yes. And a search further confused me- several threads were rather contradictory. Hopefully this is a 2 response posting, to then gently fade down the page.... For the record: http://www.l-camera-forum.com/leica-forum/leica-m9-forum/130720-m9-faqs-frequently-asked-questions.html#post1378521 Link to post Share on other sites More sharing options...
tdtaylor Posted March 3, 2011 Author Share #6 Posted March 3, 2011 Thanks, Jaap. Have to admit I often forget the FAQ, of which you've put much work into. Thanks, Link to post Share on other sites More sharing options...
Jeff S Posted March 3, 2011 Share #7 Posted March 3, 2011 Advertisement (gone after registration) Do you wear your prescription glasses when shooting? Mine (prescription sunglasses, which I always use in daylight) eliminate the need for any diopter. In any case, I find it hard to believe there's not an optician in a major metro area like Baltimore that can help. Jeff Link to post Share on other sites More sharing options...
tdtaylor Posted March 3, 2011 Author Share #8 Posted March 3, 2011 My conundrum, from just one page of one thread: "If your spectacles are +1.0 diopter, you need an additional viewfinder lens of +1.0. Do not compensate for the standard -0.5 setting." "For example, if your glasses have a strength of +1.0 dioptres, you will need a viewfinder glass with a strength of +1.5 dioptres." "The best way to determine which diopter you need is to visit your optician and hold his trial lenses between your eye and the viewfinder" [my doctor is about an hour and a quarter away] "My advice differs from Jaap's a bit. I have a mild prescription to see better at a distance (-1.5 diopters and have stigmatism-- aspherical retinae, if you will). I have been using diopters on M cameras forever and found that the only way you know which power diopter is appropriate is to try them out. I have not found a useful correlation between the Leica stated diopter power and how well it improves my focus." And that didn't get into the more technical explanations on a second page barely followed...as well as the other available threads. Since a Leica Shop with corrective lenses and my optometrist are not readily available, may just order two from B&H and return the one I don't need. Of course that means I need to guess on the first two possibilities. If only I could find the reciept for my last one . Link to post Share on other sites More sharing options...
Jeff S Posted March 3, 2011 Share #9 Posted March 3, 2011 "The best way to determine which diopter you need is to visit your optician and hold his trial lenses between your eye and the viewfinder" [my doctor is about an hour and a quarter away] Any optician can help. Just drop by the closest Lenscrafters. Jeff Link to post Share on other sites More sharing options...
tdtaylor Posted March 3, 2011 Author Share #10 Posted March 3, 2011 Any optician can help. Just drop by the closest Lenscrafters. Jeff Excellent idea. I've been going the same doctor for 25 years (my partner's brother), that it didn't cross my mind that they would assist without buying glasses. Sometimes the most obviously solution is right in front of your nose, Thanks, Link to post Share on other sites More sharing options...
Jeff S Posted March 4, 2011 Share #11 Posted March 4, 2011 Plus, it's common courtesy among opticians to adjust glasses, at no charge, even if they weren't purchased there. Jeff Link to post Share on other sites More sharing options...
pico Posted March 4, 2011 Share #12 Posted March 4, 2011 Diopter setting is very important to me with the cameras that actually have the facility. That would be my Wife's old iii, ii, or whatever the heck it is. The more important is the the Panasonic G1 which has a fabulous dioptier built-in. For the Leica M? Nada, no help at all. Condisdering the age of M owners, I'd like to think that Leica might introduce a dial-in diopter. Or am I just dreaming? (Do not wake me up, please.) Link to post Share on other sites More sharing options...
budrichard Posted March 4, 2011 Share #13 Posted March 4, 2011 Do you wear your glasses while shooting, if so, you probably need nothing, if not, this leica reference should solve the question. Leica Camera AG - Photography - LEICA CORRECTION LENSES M -Dick Link to post Share on other sites More sharing options...
lars_bergquist Posted March 4, 2011 Share #14 Posted March 4, 2011 I am badly oversighted and have no accommodation left. Without specs, I cannot see even the horizon sharply. But like the original poster, I wear progressive eyeglasses, and because different areas of the lenses give me sharp vision from normal reading distance to infinity, they cure all viewfinder problems. It is fairly easy to learn which part of the right lens that gets pressed against the eyepiece ring. The result is a sharp finder. I fear that you have over-complicated your "finding" by adding a correction lens, and that losing it may prove to be a boon. Note that progressive eyeglass lenses have no single strength. The strength varies continuously across the lens, from bottom to top. I would recommend that you experiment a bit with your normal glasses and the finder. I believe that you would find an eye position that works well. Also, with this solution you are not blind to the world outside the finder when shooting, and there's no need to put your specs on when you want to change the ISO. They are already in place! The Ancient Rangefinder Man Link to post Share on other sites More sharing options...
tdtaylor Posted March 4, 2011 Author Share #15 Posted March 4, 2011 Do you wear your glasses while shooting, if so, you probably need nothing, if not, this leica reference should solve the question. Leica Camera AG - Photography - LEICA CORRECTION LENSES M -Dick For years I have just slid my glasses up on my head. Started with my Nikons years ago, and at this point is just a habit. I do a lot of 200-400 and 600mm work for sports, and the glass were often just one more thing in the way. Guess I carried the habit to the Leica. I do use 28mm frequently, which I find is challenging to frame with the glasses on. With my glass, the viewfinder is limited to just inside the 35mm lines without moving my eye around. I can focus fine with the glasses, they are just bothersome to me and get in the way- most likely something I can get over by just using them. Thanks everyone for the thoughts. Link to post Share on other sites More sharing options...
Jeff S Posted March 4, 2011 Share #16 Posted March 4, 2011 I can't see all the photo opportunities around me without wearing glasses. I would hate to have to take them off to frame and focus. Perhaps your eyes don't require as much correction. Another option, perhaps, is contacts. Not for me, but maybe something for you to consider. Jeff Link to post Share on other sites More sharing options...
hoppyman Posted March 4, 2011 Share #17 Posted March 4, 2011 Excellent idea. I've been going the same doctor for 25 years (my partner's brother), that it didn't cross my mind that they would assist without buying glasses. Sometimes the most obviously solution is right in front of your nose, Thanks, Indeed Eye test photo - Geoff Hopkinson photos at pbase.com 1 Link to post Share on other sites More sharing options...
juergen Posted March 5, 2011 Share #18 Posted March 5, 2011 (edited) My conundrum, from just one page of one thread: "If your spectacles are +1.0 diopter, you need an additional viewfinder lens of +1.0. Do not compensate for the standard -0.5 setting." "For example, if your glasses have a strength of +1.0 dioptres, you will need a viewfinder glass with a strength of +1.5 dioptres." Terry, ask two people within Leica and you will get at least three opinions. I used the number 2 method, compensating for the standard -0.5 setting, and it worked fine for me. Having said that, I now ask myself why one should have to compensate for something a person with perfect eyesight doesn't have to compensate for? Sorry for yet more confusion. Juergen Edited March 5, 2011 by juergen Link to post Share on other sites More sharing options...
budrichard Posted March 5, 2011 Share #19 Posted March 5, 2011 I also take my glasses off when using a camera and the habit stems also from the use of Nikons in the 1960's and 1970's. I also use my left eye and the script calls for 0 diopter so each Leica has a 0.5+ diopter and that works fine for me. I would look at your script and simply get the diopter that will give you what you need taking into account the built in -0.5 bias.-Dick Link to post Share on other sites More sharing options...
tobey bilek Posted March 5, 2011 Share #20 Posted March 5, 2011 You need a correction that allows you to see at 1 meter. Take you camera to a drug store that sells reading glasses and find the strength at works. Since you have progressive lenses, then you have lost accommodation to some extent. Therefore you need to find the correct diopter to use with glasses on or glasses off and they will not be the same. With glasses on, a plus 1 should be close to allowing you to see one meter thru the TOP of the glasses. The +1 works for me and I have no accommodation . The other thing that works is computer/reading bifocals. The top is set for arms length and the reading portion for normal reading distance. Downside is who wants to change glasses for every picture. If you need to use the camera without glasses, then you need a +2 . The eye specialist can advise you for all three cases or just do the reading glasses test. 1 Link to post Share on other sites More sharing options...
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