The R line in the A7 series has always been about resolution. After using the same sensor in the past two models (A7R II and A7R III), Sony has unveiled a full frame camera with the world’s first 61MP chip. But is there more under the hood than just megapixels? Let’s find out!

What the A7R III and A7R IV have in common:
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https://mirrorlesscomparison.com/preview/sony-a7riii-vs-a7riv/