I talked to a Tech at Canon for this very situation a couple of weeks ago for a customer of mine. He told me that all cameras are set up for -1.0 at the factory. Also, you need to take your camera to your optometrist and the camera is tested without its lens. When you receive your prescription , you would subtract 1.0 from the results and that would be the diopter that you should get. Mind you that optometrist testing diopters are more fined tune in increments of 0.25 or finer. Camera diopters come in half increments only for example: -2.0, -1.5, -1.0, -0.5, 0.0, +0.5. For further information, you may call your camera's manufacturer Tech Dept.
Doesn anyone know how to use diopters to correct for your eyesight?
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