[Black] Indispensable if you would like easier focussing.

[Black] Pricey, but it's Leica. Works as advertised.

[Black] The +2.0 Diopter Correction Lens for my M9 allows me to see clearly through the view finder without using my glasses.

[Black] Just what I needed. Great leica quality.

[Black] I had my ophthalmology friend help me figure out the right strength. Leica M9 comes with a finder that is -0.5. So for my right eye correction I needed to get -1.0 (since my total right eye correction is -1.5). The diopter screws perfectly into the view finder and now my focusing is immensely improved. The piece is slick, you do not know it is there if look at your camera. Great Leica optics, punishing Leica price. I love the piece.

[Black] Works great for Leica MP. My vision is -1.25, this lens plus viewfinder of the camera gives -1.5.
Thank You B&H!

[Black] If you are far sighted and cant get that manual focus so easy anymore, stop trying to fool yourself, you and your Leica deserve this upgrade. It makes life a lot easier. It adjusts perfectly to the eyepiece and that is all. It is expensive, maybe outrageous for what it is, but I cant live without it

[Black] A well made optic and an extremely useful item for any Leica M series camera.

[Black] Easily Screws into the existing optical viewfinder of the M246. Correction is exact and certainly makes it a lot easier to focus if you are wearing prescription glasses.

[Black] Yes, if you wear glasses you need a diopter. Go to your optometrist and ask him/her what your prescription is and then purchase the compatible diopter. I am near sighted so I definitely needed a diopter to correctly and accurately focus my brand new Leica. Yes, it is seemingly expensive for what it is, but look at how much you pay for a Leica! As a previous reviewer said, it is not even noticeable once you simply screw it on.