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EF 180mm f/3.5L Macro USM (2)
 
 
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CMS-XML EF 180mm f/3.5L Macro: How to set the Focus Mode.
Setting the Focus Mode To set the AF mode, set the focus mode switch to AF . To disable the autofocus mode and focus manually, set the focus mode switch to MF and turn the focusing ring.
CMS-XML EF180mm f/3.5L Macro USM Specifications
By employing floating construction, lens extension is reduced and f value fluctuation is minimized. A ring USM (Ultrasonic Motor) provides silent AF and full-time manual focusing. As the lens length does not change during focusing, accessories such as Macro Ring Light at the front end of the lens, can be easily operated.