Canon EF 400mm f/2.8L IS III USM EF400mm f/2.8L IS III USM Instructions - Page 26
ENG-25
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Page 26 highlights
Drop-In Filters OO Because the lens optics are designed to include a filter, you must always attach either a Canon PROTECT filter or a commercially available filter before attaching a Drop-In Screw-Type Filter Holder. OO Note that filter frame thickness may prevent some commercially available lens filters from being used. OO With EOS cameras that have a built-in flash, a drop-in filter may come in contact with the camera. Before attaching/detaching a drop-in filter, detach the lens from the camera. OO The Drop-In Gelatin Filter Holder 52(WIII) and Drop-In Circular Polarizing Filter PL-C52(WIII) are also available (sold separately). OO The 52/52(WII)-series drop-in filters can also be used. However, their exterior color is different than the lens body. ENG-25
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