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I shoot mostly birds and have used both 1.4x III and 2x III with the Canon 500 F4 II, 100-400 II, 7D II and 5D IV. Here's a link to a pic using the 2x on the 5D IV and 500 II. You'll see that it's sharp.
https://flic.kr/p/XnSBUd
I've done tests against the 1.4x and can confirm an increase in resolving power with all my lenses and both bodies, compared to cropping the bare lens or 1.4x further. That being said, the limitations are real:
- slower autofocus (in low light, slow to pick up, especially in flight)
- fewer AF points, especially with 100-400 II (or none with older bodies)
- your technique needs to be excellent to perfect.
- you need plenty of light and be open to stopping down from wide open for extra sharpness ( where the 1.4x on the 500 is tack sharp wide open).
- handholding it on a 500 or 600 is very hard, although I've done it. Keeper rate goes down.
- your field of view is less, so you may miss some quick movements or action.
My experience is that it's better with the 5D IV than the crop 7D II. I don't use it on the crop camera unless a static bird and great light, but very infrequently.
So, I use it with the 500 F4 and 5D IV with good light and a solid base (tripod or beanbag). In poor light or birds in flight or handholding, I prefer to stick to the 1.4x and crop. Maybe less resolution, but more keepers. I don't use it on the 100-400.
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