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 -4 Diopter EG for Canon EOS 1D-MarkIII and EOS IDS-MarkIII:
Finally, eyeglass wearers can have the freedom to really get close to the viewfinder without wearing your eyeglasses and comfortably see all the info provided. A must for anyone who wears glasses.
Pros
Cons
Best Uses
Comments about -4 Diopter EG for Canon EOS 1D-MarkIII and EOS IDS-MarkIII:
You owe it to yourself to get one of these. Makes the transition from the viewfinder to the preview screen great.
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