Today, we’re getting the Sony a7s III, but I seriously think that the Sony a7s IV is coming next year.

I think it’s incredibly fair to say that Sony has made some significant changes to the entire Sony a7 lineup of cameras with the Sony a7s III. You’ve got touch menus, a new menu system, the new CFExpress A card type, the lowest base ISO they’ve ever had, etc. crammed into it. There’s a lot of technology, and Sony voted to still hold back in some ways. It still has a 12MP full frame CMOS sensor, and it shoots 4k video. Sony is working to really create just the best 4K video that one can get, and that’s very fair. But it’s also the opposite of what they used to do with releasing cutting edge and bleeding edge options to let the market adapt.
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https://www.thephoblographer.com/2020/07/28/look-at-history-why-i-think-the-sony-a7s-iv-is-coming-next-year/