JeffreyG wrote in post #17351415
Maybe I'm not understanding the Sony system, but I do not see any appropriate lenses in the E-mount for sports. My understanding is that A-mount lenses can be adapted, but the performance is not great with adapted lenses.
I have to admit though, I have not messed around with the Sony stuff much. My rough take is that they have a lot of mounts with very thin lens coverage so far. They kind of lost my interest initially when their initial rounds of mirrorless bodies all featured very impressive sounding frame rates....but then the EVF would simply lock and the AF would stop tracking during bursts. If they have fixed that stuff then they are on the way to being useful, now they just need to fill out the lens coverage.
They recently released a 70-200 F4 lens for the new FF FE mount. It will take them time to fully flesh out the FE lens portfolio, but they're releasing them pretty aggressively. (7 lenses in its first year, and 3 more announced for the beginning of 2015 already).
The Sony a mount adapter actually has a built in dedicated mirror, so it actually focuses as fast, or faster than a Sony DSLR. Pretty good solution while Sony builds its lens lineup. AF with non Sony lenses is terrible though.
All of that said, just don't think mirrorless cameras are poised to replace DSLR's for professional sports shooters (yet). But the technology had progressed to a point where they offer a complelling alternative, with distinct advantages, to many DSLR consumers.