Hi! I have an A7 Mark 2 and the 28-70 kit lens. I am looking for a 2.8 zoom without having to drop $2200 for a G master 24-70. I see that with the LA-EA 3 adapter I can use Sony SAM and SSM lenses and it seems to AF pretty fast. My question is do after market lenses like Tamron 28-75 auto focus? I know lens have to have own motor that isn't screw drive and I think Tamron does? Has anyone had experience with 3rd party 28-70/75 2.8 lenses on a7MK 2 using the LA-EA3? Any help would be appreciated!