Despite being part of different camera systems, the Sony A7r mark III and the Nikon D850 have two important characteristics in common.
First are their full frame sensors which are currently the best the market has to offer. They are based on the same BSI technology and lack an Anti-Aliasing filter to maximise sharpness. The Nikon has slightly more megapixels (45.7MP vs 42.4MP) but it’s fair to say that the performance should be quite similar.
Since the release of the original A7 and A7r in late 2013, Sony has been actively releasing new models at a quick and steady pace. However, its most affordable full frame E-mount camera, the A7 mark II, hasn’t received a physical upgrade for nearly three years. Still, it remains a popular choice for those wanting to dive into the world of 35mm format without spending a fortune.
The Sony E-mount range currently consists of three flagship cameras, two of which are the brand new A7rIII for the full-frame series and the a6500 for the APS-C range.* Though there are some significant differences between the two models, such as the sensor size and megapixel count, some characteristics are common to both models including a weather resistant body, hybrid phase/contrast detection autofocus, 4K capabilities, and 5-axis sensor stabilisation, just to name a few.
The distinction between the A7r and A7s sub-series has always been easy to summarise: the former is designed for ultimate still photography quality while the latter targets video makers with its stunning low light capabilities. But Sony being Sony, it isn’t surprising to find professional video specifications on the A7r mark III as well, much like its predecessor and other products such as the a6300 and a6500 for example.
Anyone who claims that mirrorless cameras cannot compete with DSLRs in this day in age certainly hasn’t spent any quality time with the Sony A9 or Sony A7r III. Both released in 2017, they target professional photographers and advanced amateurs with a need for high resolution, a snappy autofocus system, fast burst speeds and 4K video.