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CMS-XML Lenses that can be used with Extender EF1.4X III and EF2X III
Usable lenses: EF 200mm f /1.8 L USM * 280 mm f /2.5 400 mm f / 3.5 EF 200mm f /2 L IS USM 280 mm f /2.8 400 mm f /4 EF 300mm f /4 L USM 420 mm f / 5.6 600 mm f /8 EF 300mm f /4L IS USM 420mm f/5.6
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