My opinion of extenders differs from others. I use EF100-400mm f/4.5-5.6L IS II USM +2x III for wildlife that I cannot get close to. The "digital lens optimizer" in the free to download Canon DPP software knows about it and can correct the small aperture diffraction blur if there is not too much noi

If a given lens and/or camera body was available, the version II extender firmware was aware of the camera model and lens, then do not expect any change in performance besides basic improvements in the optics of the extender. Extenders come in two basic types, 1.4x and 2.0x, which each having a 1-stop and 2-stop impact on the effective aperture.

Per Canon: "This lens is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L. Additionally, please see the lens and/or camera body manual for full compatibility information with the Extender EF 2X III.
January/2015 - The EF Extender 2X III is a teleconverter that mounts between you camera and your EF compatible lens to effectively multiply its focal length by two. It does that simply enlarging 25% of the middle of your frame, discarding most of the light; thus reducing two stops of exposure (a f/2.8 becomes a f/5.6).
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 EF 2x III is sharper than previous incarnations and is a worthy accessory for compatible lenses. It often resides in the kit of anyone unwilling or reluctant to spend a lot more money for a Super Zoom alternative that costs thousands more and weighs kilograms more. The Mk III series of Extenders were designed to perform better with

My advice is don't do it. Actually don't use any 2x on any lens. The 1.4x tel-con is useable on a very few Canon lenses but not the 2x. The ability that well it fits is not a good reason to use it. Of course it is all about what you want and your requirements are. If you can settle for mediocre phot

The 2x extender will raise your f/stop minimum range by 2 full stops. Your f/4.5-5.6 range will become f/9-11.2. The firmware in most cameras disable the AF when the minimum f/stop is at f/8, or narrower, because their AF systems cannot get sufficient light to focus accurately and consistently.
Introducing Canon's second generation of IS super-telephoto lenses: EF 300mm f/2.8L IS II USM, EF 400mm f/2.8L IS II USM, EF 500mm f/4L IS II USM and EF 600mm f/4L IS II USM. Each Series III Extender features a newly developed microcomputer that increases AF precision when the extenders are used with an IS II super-telephoto lens.

Bundle Items Includes: 1 x Canon Extender EF 2X III, 1 x Lens Cap Keeper, 1 x Cleaning Kit ; The Extender EF 2X III from Canon is designed for select Canon EF mount L-series telephoto lenses. It increases the focal length of a lens by a factor of 2x while still delivering superb image quality.

The Canon 1.4x lens extender extends the focal length of a lens by 40%, making (for example) a 200mm lens function as a 280mm lens. the version III 2x extender cannot be combined with a 1.4x
AF is not available with Extender EF 2x (I/II/III) attached to the EF 180mm f/3.5 L Macro USM lens. Precise autofocusing may not be achieved if you use a lens and Extender EF1.4x III/EF2x III combination marked with an asterisk or a lens and extender in a combination marked with two asterisks.
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. Yes, but you're asking the wrong question. The Canon EOS EF 2x III will work with the Canon 90D, because it has an EF mount. Except, as others have pointed out, teleconverters are designed to only work with specific lenses. Someone posted a link to the "Supplemtary Information" User Guide for the 90D. Refer to that for a complete listing of U7UWMi.
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    • canon ef 2x iii extender lens compatibility