Which Diopter for an R4 ?

Discussion in 'Leica and Rangefinders' started by bob_suton, Nov 16, 2000.

  1. I need help decicing which diooter I ned with an R4. Anyone got info on how to determine it before purchasing several.?
     
  2. This actually depends on your vision, not the camera. If you have
    20/20 vision, or better (some people do) you do not need a diopter
    correction. If you wear glasses, and the optometrist gave you a copy
    of the prescription, look at the entry under "spherical" for your
    dominant eye (the one you look through the camera with). If you are
    right-eyed, look at the figure for "O.D." which means "right eye."
    It might say something like, '-1.5" or "-3.0" if you are nearsighted,
    or maybe +2.5 or so if farsighted. this is your diopter correction.
    It may also have an entry under "cylinder" such as "-1.0 at 100
    degrees" and this is your astigmatism correction, which could be
    included in a custom ground corrective lens.
     
  3. Actually it depends on how you want to use the camera, with or
    without your glasses. In my case I wear glasses for the distance. I'm
    near-sighted. I also wear them using my camera because I think it too
    cumbersome to remove the glasses while looking through the viewfinder
    and putting them up again when looking directly at my subject. When
    looking through the viewfinder of your R4 you look actually at the
    focussing screen at a appearant distance of around 60 cm (25"). In my
    case with advancing age, I was not longer able to see the screen
    image sharp; it appeared to close for me, the same as when reading.
    So my camera needed a reading correction, a + diopter correcting
    glass. To determine which one I went to the camerashop where I buy
    most of my equipment. They have a device (for minolta but it also
    worked for my leicas) that can be attachhed to the camera. By turning
    a dial the diopter value changes and it is possible to determine the
    correct value by looking through the viewfinder. I did this and have
    now a + 1 correction in both my R3 and R4. Only the Leitz correction
    lens comes together with a little attachment device and it was around
    $ 100. But when you need it to change it is much cheaper th ask your
    opticien to provide you with the little glass only.
    On the other hand, for my M3 I don't need any correction. It works
    just fine for me.

    <p>

    Peter Ingen Housz
     

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