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CMS-XML What is the Maximum Aperture with the EF 2x III Extender
Please note that if the maximum effective aperture falls below f/5.6, AF will not be possible
CMS-XML What is the Maximum Aperture with the 1.4X III Extender
Please note that if the maximum effective aperture falls below f/5.6, AF will not be possible
CMS-XML Lenses that can be used with Extender EF1.4X III and EF2X III
Usable lenses: *: Using an Extender with this lens may result in incorrect autofocus . If your camera has an AF microadjustment function, do the AF microadjustment. If your camera does not have an AF microadjustment function, focus manyually if the AF precision is way off.