Sunday morning, after work, I was able to do some testing with the Sony a6500 Mirrorless Camera with birds in flight. In particular, an Osprey that decided to put on a show for us :) The 11 frames a second sounds like a machine gun going off.....lol, but really no different than the sound of my Canon 7Dii when in high speed.....although the Sony's shutter is quieter. The buffer is also huge. I believe it's about 107 raw before it buffers. I never came close to hitting that while doing the testing for this Osprey....lol.
The camera did fairly well tracking, but I found I had a harder time keeping the bird in the frame due to the electronic viewfinder showing the pictures after it's taken for that split fraction of a second while the shutter kept clicking. I'm sure I can probably turn that off in the settings so that won't be an issue with birds in flight. Love the electronic viewfinder otherwise :) The tracking was fast and pretty accurate. When the bird flew over to a bright area of the sky, it did loose focus periodically and I would manually focus to get it back and then the auto focus would grab it again and hold it. It had no problem when the bird was still. Probably a communication issue with the lens to converter to Sony during fast movement. I'm thinking that if I had a native Sony lens on it, it would have been better. However, even with the non Sony lens, the camera still did very well in capturing this Osprey in flight :) I have to keep in mind that I'm asking a lot out of this camera by doing this combination with the speed of the birds. The communication has to react very fast and with a converter in between the non Sony lens and Sony body, it may have issues from time to time in getting that communication fast enough.
With static subjects, landscapes, flowers, etc, this combination with the converter to sigma or canon lenses work great. Focusing works very well and the electronic viewfinder is wonderful to see what you're going to get before clicking the shutter. Also while focusing, you can touch the screen and move the focus point to where you want while looking through the viewfinder. This helps with difficult focus to pinpoint exactly where you want it. And it works great :)
I've posted a 'few' pictures of the results from Sunday morning below :) More testing coming later....
Taken with Sony Alpha a6500 Mirrorless Digital Camera with Sigma MC-ll Converter (EF Mount to Sony E), & Canon EF 100-400mm f/4.5-5.6L IS II USM Lens @ 400mm
Feel free to share :)