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CMS-XML EF 600mm f/4L IS USM : How to set the focus mode.
Selecting the Focus Mode To use the autofocus mode slide the focus mode switch to " AF ". For manual focusing set the switch to "MF" and rotate the manual focusing ring.
CMS-XML EF600mm f/4L IS USM Specifications
EF600mm f/4L IS USM High-speed autofocusing is achieved by the weight reduction of the group of focusing lenses and improvement of the autofocusing drive algorithm. A new AF stop function, which stops autofocusing temporarily, is adopted. Manual focusing is performed mechanically to save power.