A 4x “digital TC” is only using one sixteenth of the sensor area, so that’s a 1.5MP image. When that is upscaled to 24MP, you’re not going to have “image quality retained”. It’s a trick, pure and simple, more suitable for smartphones than cameras. But then I guess that’s the target demographic.
If I recall correctly, TC's will AF on the 7D as long as the combined aperture doesn't exceed f/5.6. Example. 70-200mm f/2.8 + 1.4 equals f/4 and therefore should work. riknash's gear list: Canon EOS 7D Mark II Canon EOS 5D Mark IV Canon EF 24-70mm F4L IS USM Canon EF 200-400mm f/4L IS USM Extender 1.4x HTC One.
The 2x extender and the RF 100-500 made it so I barely needed to crop the final image, and usually only needing to do a bit of centering more than anything else. Image not available. Click here to go to its original location (external website). 1000mm, f/14, 1/1600th, ISO 1000.
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An f/2.8 lens can take a 2x TC and still be only an f/5.6 aperture, so it will still AF on any Canon body. These are certainly more expensive than the $1800 100-400 L, but older used ones can often be found on eBay and Craigs List for around $3000 to $3500 (original non-IS versions), and starting around $3500 to as much as $6000 (IS versions).
Stopping this combination down to f/5.6 results in very good sharpness. Adding the 2x III reduces sharpness/contrast even more. With the 2x mounted, CA remains similar to that of the 1.4x and barrel distortion is reduced. Again, a 1-stop narrower aperture results in a more-pleasing image when the 2x extender is in place.
Designed as a lightweight and affordable extreme telephoto prime for Canon RF-mount shooters, the Canon RF 600mm F11 IS STM is a versatile lens for casual wildlife and general photography. If 600mm isn't enough for you, it can be paired with Canon's new 2X extender for RF to become a very portable (and very slow) 1200mm F22. The Kenko's are not as sharp as Canon's. You can stack the EF 2x II with any Canon EF teleconverter. So you can stack as many EF 2x II on top of each other all you like. The EF 300/2.8 L holds up reasonably well with the EF 1.4x III and EF 2x II. I found with the EF 500/4.5 L I got very similar results with the stack as with just the 2x. As mentioned at the beginning of this review, the Canon RF 400mm F2.8 L IS USM Lens is compatible with the Canon RF 1.4x Extender and the Canon RF 2x Extender. Lacking an EF mount, this lens is not compatible with the Canon Extender EF 1.4x III and the Canon Extender EF 2x III. With the 1.4x behind it, this lens becomes a 560mm f/4 IS lens.

MSRP Price: $429. Made in: Japan. Production Status: In Production. Lens Description: Designed to extend a lenses focal length by a factor of 2x, the redesigned Canon Extender EF 2X III delivers optical performance on par with the finest Canon super telephoto lenses. It features a built-in microcomputer for seamless communication among camera

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    • canon extender ef 2x iii sample images