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.
The Canon extenders will not work with the EF-S lens which is why I have the Kenko 2x extender. The bumblebee was two cheap third party extenders stacked and wide open at F/16. I often use EF100-400mm f/4.5-5.6L IS II USM +2x III which autofocuses well on EOS R5.
In general 2X teleconverters and extenders are only recommended for f/2.8 or faster lenses. Some bodies (most of the 1D series, the 5D Mark III, and the 7D Mark II) can use the center AF point with f/8 lens/extender combinations. But the narrower PDAF baseline of the APS-C cameras makes this much more difficult than for their full frame
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
03-18-2022 04:31 AM - edited ‎03-18-2022 05:07 AM. You can't use a Canon extender with any EF-S lens, they aren't incompatible - not all EF lenses will work either - extenders are designed only for specific L-series EF lenses (and a couple of DO ones), one of the reasons they are white. For example, the excellent EF 70-300L lens is not
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canon ef 2x iii extender lens compatibility
