Canon EOS R6 + EF 100-400mm f/4.5-5.6L IS II USM lens + EF 2x III Extender. . I wanted to spend more time with the EF 2x III Extender on the EOS R6. I prefer the EF 1.4x III Extender for its wider aperture range and much smaller size and image quality from the EF 1.4x III is very close to what you get from the lens unaided.
I have been using the 1.4x extender with various models of the 70-200 f/2.8 along with other telephotos for 25 years. I love the 1.4x and hate the 2x. I have seen almost negligible change to an image with the 1.4x on an L lens and no difference in autofocus speed. The 2x is noticeably soft and the focus slows way down.
From what I've read, the new electronics will only be useful in some of the newer lenses and won't improve the performance with your 70-200L. As for the improved optics, most reviewers have indicated that the difference in IQ between the 1.4x II and III is pretty slight, while the difference between the 2x II and III is more noticeable.
A 2x is going to significantly degrade image quality, but the kicker is the 100-400 ii at 200mm is sharper than the 70-200 f2.8 ii at 200mm and at 400mm is about the same center sharpness (or better) as the f2.8 ii at 200mm See photozone.de. Clearly the 70-200, f2.8 ii with a 2x extender is not going to be anywhere near as sharp as the 100-400 ii.
1. 2X III works really well and maintain a reasonable sharpness only on Superteles, 100-400 II and on on 70-200 II and unfortunately not included the 100-400 I. It's a waste of money. kingfishers are one of the skittish creatures, it posts a challenge even with 600mm + 2x.
You mention using the EF 70-200mm f/2.8L IS USM "II" lens That works well with the EF "III" Extenders. It might also work well with the EF "II" Extenders, but is not something I've ever tried. (I have use the EF 1.4X II on the EF 100-400mm II with excellent results.) I have no idea how that lens
Version II and III of the 1.4X and 2X will work with that lens, I suspect the original versions do also but I would go with the later version II or III. However, I wouldn't bother with the 2X in any version because it turns an excellent lens into a mediocre lens. It isn't terrible, but even with Ca
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canon extender ef 2x iii 70 200 f2 8
