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Using the internal extender on the EF 200-400mm f/4L IS USM Extender 1.4x
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Internal Extender Switch When the lens or camera is in operation (during Auto Focus , Image Stabilization*, exposure, continuous shooting, use of the focus preset, power focus operation, etc.). ... Not doing so may result in an error message being displayed (ERR01) and prevent shooting operation. Turn the camera OFF and then ON to clear the error message . ... Not positioning the lever correctly will create shadown in images and cause AF , AE, and other functions to not work properly.
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Setting the Focus Mode on the EF 400mm f/4 DO IS USM lens
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Setting the Focus Mode After autofocusing in ONE SHOT AF mode, focus manually by pressing the shutter button halfway and turning the focusing ring. (Full-time manual focus.)
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Setting the Focus Mode on the EF 800mm f/5.6L IS USM lens
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Setting the Focus Mode After autofocusing in ONE SHOT AF mode, focus manually by pressing the shutter button halfway and turning the focusing ring. (Full-time manual focus.)
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Setting the Focus Mode on the EF 500mm f/4L IS II USM
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Setting the Focus Mode After autofocusing in ONE SHOT AF mode, focus manually by pressing the shutter button halfway and turning the focusing ring. (Full-time manual focus.)
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EF200mm f/1.8L USM : How to use the Focus Preset Function.
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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.
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Using Focus Preset on the EF 800mm f/5.6L IS USM lens
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Focus Preset When turning the playback ring, keep your finger away from the shutter button. In One -Shot AF mode, the exposure will be locked when you press the hsutter button halfway and focus is achieved. So if you press the shutter button halfway while turning the playback ring, the exposure may not be correct.
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Using Focus Preset on the EF 400mm f/4 DO IS II USM lens
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Focus Preset When turning the playback ring, keep your finger away from the shutter button. In One -Shot AF mode, the exposure will be locked when you press the hsutter button halfway and focus is achieved. So if you press the shutter button halfway while turning the playback ring, the exposure may not be correct.
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