With recent image sensors, including that of your 5D IV, the 1.4X plus a bit of cropping will result in the same coverage with equal and generally better image quality. Rodger. EOS 1DX M3, 1DX M2, 1DX, 5DS R, M6 Mark II, 1D M2, EOS 650 (film), many lenses, XF400 video. 1 Like.
There are two lenses that do work well with a 1.4x tel-con. Never the 2x however. The ef 70-200mm f2.8L and the ef 300mm f4l IS. The nice thing about the 300mil is it has the IQ to give up, but it becomes a 4200mm f5.6 lens with IS. Canon's fantastic and unique ef 400mm f5.6L does not have IS. So the converted 300mil is a good give and take.
Enjoy more zoom on your existing lenses by choosing a Canon extender lens to add to your kit. with compatible RF lenses compact EF lens extender
Caveats (Supported Lenses and Stacking) Canon’s extenders, both the 1.4x III and the 2x III, have front elements that project into the rear of the lens their mounted to. As a result, they’re not universally compatible with all of Canon’s lenses, and I can’t even begin to comment on compatibility with 3rd party lenses.
Key Features. The B4 2/3" to Canon EF Adapter from MTF Services Ltd enables the use of ENG style B4 2/3" lenses on cameras with the Canon EF mount. The adapter features multi layer coated optics, solid aluminum construction and a chrome plated EF mount. A lens support bridge for use with industry standard 15mm rod support systems is also included.
In 2020 Canon also announced Extenders for the R system – the Extender RF 1.4x and Extender RF 2x. These high performance Extenders multiply the effective focal length of the lens to which they are attached by 1.4x or 2x. So, for example, a 400mm lens becomes 560mm with a 1.4x Extender, and 800mm with a 2x Extender.

Anybody tried out the Canon EF 2x III Extender with the EF 70-200mm f/2.8L IS II USM? I have a Canon 5d Mark III w/ 24-105mm and 70-200mm lenses on the way, I'm wondering how well the extender works with them, especially the 70-200. I'm hoping that it'd work pretty well for airshows and wildlife.

I don't believe any Canon EF teleconverters are compatible with EF-S lenses. Only Full Frame EF lenses are. But not any EF-S lenses. For the OP if it's in your budget look into any of the Canon EF 70-200mm F/2.8L IS series lenses. Canon has released 3 revisions of the stabilized version.
I don't have a huge budget so I can't afford 100-500mm lense or the new 200-800mm lense. So I'm hesitating between the 600MM F11 (400$ used) and/or 800MM F11 (625$ used) VS. Using a Canon RF 2x Extender on my RF 100-400mm F5.6-8 IS (550$ used). Your advices would be really appreciated and thanks in advance for your generosity.
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    • canon extender ef 2x compatible lenses