It seems like just yesterday that Sony introduced its full-frame mirrorless system which began with the A7 and A7R. More than five years later, we’ve arrived at the fourth generation of a series that has grown significantly in terms of popularity and performance.
The “R” segment used to place image quality and high resolution at the top of the priority chain, but the introduction of the A7R II changed that.
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https://mirrorlesscomparison.com/sony-vs-sony/a7r-iii-vs-a7r-iv/
