The Canon 2x EF Extender is designed to work with Canon L lenses. There is a link on this page which leads to a compatibility chart showing all lenses that it works with.
Canon's EF Extenders . Similary to the 1.4x series, there isn't an appreciable difference between the version II and III 2x Extender, at least as sharpness is concerned. Using a 2x Extender
She didn't want anything too bulky to be able to take it hiking, so she bough a Canon 100-400mm f4.5-5.6 L IS USM. Now, the lens works great, but as the reach is a bit short for some things she also bought a 2x Canon teleconverter. The problem is, the AF doesn't work with both. Looking into the documentation of the lens, it turns
The EF 100–400mm f/4.5-5.6L IS USM and the EF 200–400mm f/4L IS USM Extender 1.4x. (note that the EF 200–400mm f/4L IS USM Extender 1.4x can use EF 1.4x or 2x Extenders, in addition to its built-in 1.4x Extender) All other Canon EF, EF-S, TS-E and MP-E lenses are officially not compatible with Canon’s EF Extenders and we do not
EF 50mm f/1.8 II: EF 85mm f/1.2L USM: EF 85mm f/1.2L II USM*(5) You can also correct RAW images taken with the compatible lens even when the extender is attached.
The Canon EF Extender 2x III features five groups/nine elements that ensure improved optical performance. All optical elements use Canon’s super-spectra coating, which reduces ghosting and flare to minimize post-processing requirements and a fluorine coating on the front and rear elements makes smudge marks much easier to clean.
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canon extender ef 2x ii compatibility chart
