Leica Diopter Correction Lenses provide near or far-sighted users a clear viewfinder image without the use of eyeglasses. Ten Diopter Correction Lenses are available, from -3 to +3.
For the M series.
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Comments about Leica +1.0 M Diopter:
I'm not sure why Leica didn't put an adjustable diopter on my M9. At any rate, it was quite a challenge to find out which strength diopter to purchase. I wear +2 readers, and after too much online research, I decided to order the +1 Leica Diopter and it's perfect.
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