I'm convinced the extender isn't what I need. Agree, it is not a good marriage. A tel-con is almost always a bad idea and or just a Band-Aid solution. Almost any native FL tele will be better in all regards. There are a few exceptions but very few and they are all the 1.4x tel-con not the 2x.
I have just purchased a Canon EF 2x III Extender to use with a Canon EOS 1DX Mk II and a Canon EF 300mm f/2.8L IS II USM Lens, which I believe should both be compatible. The lens and camera work perfectly without the extender added. However when I add the extender and then look in the viewfinder, all you can see is a circular image (which moves
EXTENDER EF1.4X III / EF2X III Instruction Manual. The file is a manual (PDF file) for EXTENDER EF1.4X III / EF2X III. Download drivers, software, firmware and manuals for your Canon product and get access to online technical support resources and troubleshooting.
There's a protective rubber rim around the protruding elements to avoid damaging a lens if an incompatible one is used. It fits about 25 different Canon lenses the last time I looked, with all but two of those being L-series lenses. . The EF 2x III Extender has the Canon Super Spectra Coating to help reduce flare and/or ghosting.
Yes, the EF 2X III extender is compatible with the EF 70-200mm f/2.8L IS USM. As previously noted, the optics can degrade image quality. AF speed and accuracy can take a hit, too. But, your actual performance will also greatly depend on the camera body that you are using.
None of Canon's Teleconverters are compatible with the EF 24-70mm F/2.8L USM series lenses. I would look into a longer lens instead of using a teleconverter. With the 1.4x teleconverter you loose 1 stop of light. With a 2x teleconverter you lose 2 stops of light. With certain camera body and lens combos AF WILL NOT BE POSSIBLE.
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canon ef 2x iii extender lens compatibility
