Canon EF 8-15mm f/4L Fisheye USM Instruction

Also see for EF 8-15mm f/4L Fisheye USM: Instructions

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ENG-7“C” and “H” MarkingsAdjacent to the zoom ring, the “C” and “H”markings serve as guides to indicate the wide-angle zoom position where focus is set at infinityat which photos can be created withoutvignetting when using EOS digital camerasinstalled with APS-C or APS-H image sensors.The “C”/”H” indicator on the zoom ring is alignedwith either the “C” or “H” marking.Zoom LimiterThe zoom limiter function allows for wide-anglephotos to be created when focus is set at infinitywithout vignetting when using an EOS digitalcamera installed with an APS-C image sensor bylimiting the zoom range.Activate the zoom limiter by setting the zoom ringto between 10mm and 15mm, then slide theswitch towards “LIMIT.”ZoomingWhen the “C” / ”H” indicator above the focus ringis aligned with either the “C” or “H” marking, thereare times when vignetting occurs in the corners ofan image since the size of the image circlebecomes smaller when the focus position is set atclose range due to the optical characteristics ofthis lens.The zoom limiter cannot be used if the zoom ringis set between 8mm and about 10mm (when the“C” / “H” indicators on the zoom ring are setbetween the “C” indicator and the wide-angledirection on the ring next to the zoom ring).