I have an a7Mk2 and a cat. The cat moves rapidly, particularly when I want to take pictures of him so need good AF and a zoom lens longer than the kit lens. I'm wondering if the LA EA4 adapter and an A mount lens (like Minolta 70-200 2.8) would be quick enough or if I should settle for the optically slower and not well liked FE 4 70/200 G zoom? Also, the a7 cameras seem to eat batteries at a fierce rate, Airplane Mode or no, and no doubt the legacy lens idea gets you into heavier battery drain so even shorter life and probably part of the reason for slower AF. Thoughts?