It was announced on 25 October 2017 as the successor to the Sony α7R II launched two years prior.

The camera shares many features with the α7R II, including the same 42.2 MP resolution for still photography.

It was superseded by the Sony α7R IV in July 2019.

The camera does not include an optical low-pass (anti-aliasing) filter.

[3] Several improvements were made compared to the α7R II, including the following:[2] https://www.sony.com/electronics/interchangeable-lens-cameras/ilce-7rm3a/specifications