Canon Dioptric Adjustment Lenses provide near or far-sighted users a clear viewfinder image without the use of eyeglasses. The Dioptric Adjustment lens fits into the eyepiece holder of the camera.
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Comments about +3 Diopter EG for Canon EOS 1D Mark III and EOS IDs Mark III:
Unit does not snap on the veiwfinder very well. It is easy to come off when pulling the camera from the bag.The original seems to fit much more tightly. It does allow using the camera without having to wear glasses.
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