Hi, I'm looking to get some hot shoe flashes for my Sony A7R2. I'm completely clueless about flashes, and so I don't know what the benefit of TTL is and if I want or need it, so advice would be very welcome. Is TTL the ability to alter flash settings in camera rather than manually?? I've been looking at the Lumopro LP180R which thestrobist recommends, or the godox TT68TSS https://www.thephoblographer.com/2016/05/24/review-godox-thinklite-tt685s-ttl-sony/ which is cheaper... I'd expect to use the flash/es off camera for macro, and think maybe to get 2 flashes and some light modifiers. I'd probably use one flash in hotshoe for events/friends' weddings etc. Can anyone give some advice or recommendations of good flashes for Sony for my purposes?