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EF 17-40mm f/4L USM (2)
 
 
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CMS-XML EF17-40mm f/4L USM : How to set the Focus Mode
(Diagram for reference only) To use the autofocus mode, slide the focus mode switch until it is aligned with the AF mark For manual focusing , slide the switch to the M mark and rotate the manual focusing ring
CMS-XML EF17-40mm f/4L USM Specifications
Specifications for the EF 17-40 f/4L USM The 17 mm focal length achieved by the EF17-40mm f/4L USM lens also extends wide-angle shooting potential when paired with digital AF SLR cameras, such as the high-end amateur-model EOS 10D , which have smaller imaging areas than 35 mm film. Taking into account the smaller angles of view that result, the new lens realizes a focal range equivalent to 27-64mm in the 35mm format (or 1.6 times) when paired with EOS 10D.