SnapperJ Posted February 1, 2007 Share #1 Â Posted February 1, 2007 Advertisement (gone after registration) I hope someone can advise me. Do I need to use a dioptre correction lens on my M8? I where glasses to read, my distance eye sight is good. If I should fit a dioptre, how do I take account of the -.5 which I believe is fitted to the M8? Thanks Link to post Share on other sites More sharing options...
Advertisement Posted February 1, 2007 Posted February 1, 2007 Hi SnapperJ, Take a look here M8 Dioptre. I'm sure you'll find what you were looking for!
carstenw Posted February 1, 2007 Share #2 Â Posted February 1, 2007 Are you near-sighted or far-sighted? If you are near-sighted, the -0.5 should not bother you. If you are far-sighted enough to need reading glasses, it might cause focusing difficulties for you. For example, if you use +1.0 glasses, you would put a +1.5 diopter on the M8, given the built-in -0.5. Link to post Share on other sites More sharing options...
lars_bergquist Posted February 1, 2007 Share #3 Â Posted February 1, 2007 Hi. Don't worry about the -5 dioptries. This is not 'fitted' but part of the finder set-up. It means that the light frames and the rangefinder are at an apparent (or optical or virtual) distance of 2 meters.That will be 79 inches. Now, if you have sharp vision at that distance, and decent vision at infinity, you have no problems. The finder will fit not only your M8 but you too! Â If you have problems, then my advice is to go to an optician or simply a well-appointed gas station and check out the cheap plastic reading glasses. These are marked in dioptries. (At least here in Europe.) When you have found a pair that lets you use the Leica finder without any problems, note the dioptries. That is the strength you need. Don't forget plus (for farsightedness) or minus (nearsightedness). Â The correction lens itself is a small flat affair that you screw in on top of the finder eyepiece (there's a screw thread inside the rubber rim). The correction lens too is rubber-rimmed, so that it will not scratch your precious specs. The increase of eye relief is much less than what specs force upon you, so that you will have much less trouble seeing that pesky 24 mm frame. Be advised however that if you need more dioptries than about 1/2, you will not see anything sharply outside the camera finder! So frankly, I prefer to use my progressives. After one or two tries it becomes instinctive how to look though the eyepiece and see everything sharp. And I can still keep obbo on the surroundings, and maybe adjust speeds. Â The old man from the Age of Brilliant Finders Link to post Share on other sites More sharing options...
stunsworth Posted February 1, 2007 Share #4 Â Posted February 1, 2007 Jeremy, as mentioned above don't worry too much about the -.5 in the camera body. I have reading glasses that are +2 diopters and I bought a correction lens of the same strength +2. Everything is now sharp again :-) Link to post Share on other sites More sharing options...
Shootist Posted February 1, 2007 Share #5 Â Posted February 1, 2007 Well I have to differ with some of the other replies. I am going throught this right now. I normally wear +1.5 store bought reading glasses for normal sight like seeing a computer screen at normal distances. Some times I wear +1.75 to read a book and for closer work. I bought a Leica +1.5 diopter and I still have problems focusing at any distances, although focusing on near object isn't to bad. The one thing I forgot to do when ordering the first diopter was to factor in the -.5 of the viewfinder. So I really think you need to add on the -.5 of the viewfinder. I have since ordered a +2 Leica diopter which should arrive today. Hopefully that will clear everything up. I will post back to this thread later today when and IF the +2 diopter shows up and I give it a try. Another item I'm going to get is the 1.25X viewfinder magnifier. Switching from a M3 to a M8 makes me think I'm looking through a tunnel. I even have to close my other eye when using the M8. I don't have to do that with the M3. Link to post Share on other sites More sharing options...
chetccox Posted February 1, 2007 Share #6 Â Posted February 1, 2007 I think what some of the posts imply when they say not to worry about the -.5 is true if, as the one post suggests, you try different glasses with your M8 and choose the diopter that looks best. You have a 1.5 and are probably right on the edge of focus, whereas if you were in the middle area it would probably have worked. I can use a 2.0 and it is marginally ok. A 2.5 is better. A 3.0, which I have, is actually a little too strong, but I am sure that soon it will be perfect as my eyes age even more. I would bet that the 2.0 will work very well for you, so let us know how it looks after you receive it. Link to post Share on other sites More sharing options...
Guest guy_mancuso Posted February 1, 2007 Share #7 Â Posted February 1, 2007 Advertisement (gone after registration) With the 1.25 I just don't see the advantage , I wear 2 + reading glass and on and off just don't much of a difference, maybe it's me Link to post Share on other sites More sharing options...
chetccox Posted February 1, 2007 Share #8  Posted February 1, 2007 Guy  I assume you are referring to the 1.25 magnifier. This is not a diopter. Do you mean that when you look through the 'magnifier' with or without your glasses it looks the same? I have the 1.25 magnifier as well, but I either have to look through it with my glasses, which is cumbersome, or without glasses but using the 3.0 diopter. Either way it is in focus, but one either has to use glasses or the diopter. If you have 2.0 reading glasses I can't see how it would be in focus for you without the glasses. The red exposure info is the easiest to check for focus. Look at it carefully with and without. Link to post Share on other sites More sharing options...
Guest guy_mancuso Posted February 1, 2007 Share #9 Â Posted February 1, 2007 Yes I have the 1.25 magnifer. I'm far sighted. with the magnifier on i see no real differene having my glasses on or off . Link to post Share on other sites More sharing options...
bnelson Posted February 1, 2007 Share #10 Â Posted February 1, 2007 I use the 1.25 magnifier combined with a -2.0 diopter. I keep it on the M8 all the time. Â Focus for me is much better with the 1.25 magnifier. Â Bill Link to post Share on other sites More sharing options...
Guest guy_mancuso Posted February 1, 2007 Share #11 Â Posted February 1, 2007 Bill near sited or far sighted Link to post Share on other sites More sharing options...
JohnM Posted February 1, 2007 Share #12 Â Posted February 1, 2007 I need +1.5 glasses for reading so following Leica'a recommendation,purchased a +2 diopter.When I tried it,I could not see anything in the viewfinder clearly.It was worse than with out the diopter.I may just try with the uncorrected viewfinder more.I only have my M8 a week and love it.Thanks to Sean,Guy and everyone else in the forum! Link to post Share on other sites More sharing options...
Guest guy_mancuso Posted February 1, 2007 Share #13 Â Posted February 1, 2007 Just not sure this helps far sighted people since the patch is what your looking at. Not sure but I don't think I will order one until i can try it at a store Link to post Share on other sites More sharing options...
truando Posted February 1, 2007 Share #14 Â Posted February 1, 2007 the viewfinder is calibrated for infinity. this means that people that need reading glasses do not benefit from dioptre lenses. It's when you have trouble seeing objects that are far from you that the dioptre lenses will help you. Link to post Share on other sites More sharing options...
Guest guy_mancuso Posted February 1, 2007 Share #15 Â Posted February 1, 2007 Thanks You Christian this was exactly what i was thinking, saved me some money Link to post Share on other sites More sharing options...
chetccox Posted February 1, 2007 Share #16 Â Posted February 1, 2007 the viewfinder is calibrated for infinity. this means that people that need reading glasses do not benefit from dioptre lenses. It's when you have trouble seeing objects that are far from you that the dioptre lenses will help you. Â Â This is simply not correct. The viewfinder is not calibrated at infinity for one thing. The diopter correction lenses (+1, +2, +3) are IDENTICAL to reading glasses of the same diopter. The statement that people who need reading glasses will not benefit from the diopter lenses is false. There are of course people who need correction for both near and far, and since I am not one of these I am not sure how that works. My vision is perfect beyond 1.5 meters or so, but I need glasses to read comfortably. The diopters work. Link to post Share on other sites More sharing options...
SnapperJ Posted February 1, 2007 Author Share #17  Posted February 1, 2007 Thanks for all the help and yes I am farsighted. I seem to be able to focus ok, but have to look real intently. I am not sure if this is normal for a range finder or not. I suppose I am just hoping that focusing will be a little easer. I have been spoilt by auto focus on the Canon 1D,s for quite a while, not that I am not enjoying using a rangefinder again. I just need to improve my speed of focusing .  Regards  Jeremy Link to post Share on other sites More sharing options...
Cindy Flood Posted February 1, 2007 Share #18 Â Posted February 1, 2007 My long distance vision is perfect, but I do need reading glasses. I have opted to wear a contact in my left eye for reading. It is a +2.75 diopter. I focus with my long distance eye. Â I just tested this out on my M8. I tried focusing with my left eye (with the +2.75 diopter) and I could not focus. I used an object at infinity and an object 3 feet away...everything was blurry. I would say that this bears out Christians conclusion that you don't need a diopter unless you are correcting for long distance. Â Edit: Chet was posting at the same time that I was. Now I am really confused. I hope someone else that has the diopter and reading glasses can shed some more light on this. Link to post Share on other sites More sharing options...
truando Posted February 1, 2007 Share #19 Â Posted February 1, 2007 no problem guy, you helped me on lots of issues, I've been reading this forum for a while. Â now chetccox, regarding the reading glasses, I do have reading glasses, and I went to my dealer for dioptre lenses, and he was the one who told me about this infinity thing, he knows what he's talking about because he has sold tons of leicas in the last 30 years he's in the business. Â So unless someone else proves him wrong with hard evidence I will stick to what my dealer told me. Link to post Share on other sites More sharing options...
chetccox Posted February 1, 2007 Share #20  Posted February 1, 2007 Nikon SLR cameras (without built-in adjustable eyepiece correction) have a base diopter value of minus one. This is why you won’t find an accessory Nikon eyepiece diopter valued at minus one. Minus one is considered the optimum starting point for the majority of SLR users with normal vision. The combination of the camera’s viewfinder components and a clear (standard) eyepiece form a virtual image of a subject on the camera’s focusing screen that is the approximate equivalent of a viewing distance of one meter.  Each Nikon eyepiece diopter incorporates a numerical value, represented by a minus value (nearsighted) or a plus value (farsighted) number, enabling you to select the appropriate diopter for your vision and your camera model.  To determine which Nikon diopter value is best suited for you, visit your ophthalmologist, optometrist or dispensing optician. Ask them to determine your diopter from (your corrective prescription) when viewing an object at distance of approximately one meter. Base your selection on this diopter value.    (For the Leica M8, it is 2 meters)  This is from nikons website Link to post Share on other sites More sharing options...
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