EF20mm f/2.8 USM : How to manually touch-up focus.
Article ID: ART151828
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Date published: 05/22/2015
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Date last updated: 02/03/2016
Description
How to manually touch-up focus.
Solution
Manual touch-up focusing
The lens enable manual focusing even in the autofocus mode. With the camera set to the One-Shot AF mode, manual focusing is possible after the lens autofocuses and stops while the shutter button is pressed halfway