ramosa Posted April 16, 2012 Share #1 Â Posted April 16, 2012 Advertisement (gone after registration) My eye check today indicates my right eye is at -1.0 diopters. I know M8s are (without diopter correction) set at -.5. Thus, I need to purchase a -.5 diopter correction lens, right? (Thus, -.5 + -.5 = -1.0 ...) Â Thanks for any help/confirmation. Link to post Share on other sites More sharing options...
Advertisement Posted April 16, 2012 Posted April 16, 2012 Hi ramosa, Take a look here diopter question. I'm sure you'll find what you were looking for!
ramosa Posted April 16, 2012 Author Share #2 Â Posted April 16, 2012 in some posts online, some folks are saying my explained approach makes sense, but that they'd actually recommend getting a -1.0 diopter and find that it works better. any experience with these things? Link to post Share on other sites More sharing options...
Lightwrangler Posted April 16, 2012 Share #3 Â Posted April 16, 2012 Taking half a diopter more then needed is a good advice. Â Mike Link to post Share on other sites More sharing options...
spydrxx Posted April 17, 2012 Share #4 Â Posted April 17, 2012 If you can actually try one out before purchasing it, you will at least know if the strength works for you. Link to post Share on other sites More sharing options...
jaapv Posted April 17, 2012 Share #5 Â Posted April 17, 2012 If you don't want to check the strength using your optician's try-out lenses, at least walk into a chemist and use the 5 euro spectacles from his throw-away glasses stand. Link to post Share on other sites More sharing options...
jaapv Posted April 17, 2012 Share #6 Â Posted April 17, 2012 Or use the proper tool Your reading strength is an incorrect value; the viewfinder elements are at a virtual distance of 2 m. So you correction should be at two meters and your accomodation should be able to take care of the virtual distance of your subject. If your eye's accomodation cannot handle that the 2m value should have precedence. Link to post Share on other sites More sharing options...
stunsworth Posted April 17, 2012 Share #7 Â Posted April 17, 2012 Advertisement (gone after registration) If you don't want to check the strength using your optician's try-out lenses, at least walk into a chemist and use the 5 euro spectacles from his throw-away glasses stand. Â Here in the UK you don't seem able to buy -ve dioptre glasses over the counter. Link to post Share on other sites More sharing options...
andybarton Posted April 17, 2012 Share #8 Â Posted April 17, 2012 You can only get + dioptre reading glasses over here Link to post Share on other sites More sharing options...
jaapv Posted April 17, 2012 Share #9 Â Posted April 17, 2012 In that case it's off to the optician, then. Just hold his tryout lens in front of th ocular and peer through. Link to post Share on other sites More sharing options...
ramosa Posted April 17, 2012 Author Share #10 Â Posted April 17, 2012 Thanks all. I will try the local Walgreens and see if they have - diopter reading glasses. Link to post Share on other sites More sharing options...
spydrxx Posted April 17, 2012 Share #11 Â Posted April 17, 2012 I don't think I've seen (-)diopter glasses OTC here in the States. Link to post Share on other sites More sharing options...
andybarton Posted April 17, 2012 Share #12 Â Posted April 17, 2012 Why are only reading glasses in the positive diopter strengths sold over the counter....? - Yahoo! Answers Link to post Share on other sites More sharing options...
ramosa Posted April 17, 2012 Author Share #13 Â Posted April 17, 2012 OK, I guess the Walgreens approach won't work. I have a call into my optician. I hope he can tell me or I can stop by there again. Thanks for the input. Link to post Share on other sites More sharing options...
pico Posted April 17, 2012 Share #14 Â Posted April 17, 2012 Leica and after market minus diopters are available. Â This one, -.5, Leica is a bargain. Link to post Share on other sites More sharing options...
jaapv Posted April 18, 2012 Share #15 Â Posted April 18, 2012 Not really. It is for Leicaflex and will not fit a M camera. Link to post Share on other sites More sharing options...
rick_dykstra Posted April 20, 2012 Share #16 Â Posted April 20, 2012 in some posts online, some folks are saying my explained approach makes sense, but that they'd actually recommend getting a -1.0 diopter and find that it works better. any experience with these things? Â Yes, this would be the way to go. Provided your eyes still have some focussing accommodation (which tends to evaporate at around age 50) you will be fine. Â Quick test: with a prescription of -1.0 you can probably read screen text at about a meter. Do that, and then hold your hand 20cm from your eyes (a hand span away). Can you focus on your hand? If so, -1.5 overall diopter adjustment will work. Your eyes will cope. Â Enjoy. Link to post Share on other sites More sharing options...
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