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 +1 Diopter EG for Canon EOS 1D-MarkIII and EOS IDS-MarkIII:
This diopter eyecup makes focusing much easier and surer. You can get a true adjustment for the focus on all subjects and manual focus is much improved.
Pros
Cons
Best Uses
Comments about +1 Diopter EG for Canon EOS 1D-MarkIII and EOS IDS-MarkIII:
Useful, improves the visual experience, helps when focusing manually. Lock might have been better. I usually carry two with me. Lost once while in a rush getting the camera out of the bag as it rubbed against the bag wall (and lock broke).
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