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EF 300MM F/2.8L IS USM (3)
 
 
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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.
CMS-XML How to use the Circular Polarizing Filter PL-C.
Using drop-in polarizing filter PL-C AF photography is possible with the Canon Circular Polarizing Filter PL-C Be sure to correctly insert the filter so that the side marked "FRONT" faces the front of the lens
CMS-XML EF 300mm f/2.8L IS USM Specifications
This lens has also "camera shake correction mode 2" which corrects shaking of the viewfinder image when, for example, shooting a moving object, and a tripod can be used with the camera shake correction function ON. 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.