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CMS-XML EF200mm f/1.8L USM : How to use the Focus Preset Function.
To turn off the beeper tone, slide th signal selector to the left When using the focus preset function in the ONE SHOT AF mode, be sure to remove your finger from the shutter button before you rotate the reading ring, otherwise the exposure may be incorrect (exposure locks when the shutter button is pressed halfway). Slide the focus preset switch to OFF when focus preset is not in use.