Performance
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Performance

In terms of autofocus, the a7R II roundly outperforms the a7 II but when it comes to general operational speed it is markedly more sluggish in some ways. Image review especially can be very frustrating, as the a7R II's huge files (made even larger if you select uncompressed Raw) can take several seconds to become available to review and zoom to check focus after they've been shot. When capturing sequences of images, the a7R II gives the kind of buffer-clearing times that we've not been used to since the early days of digital DSLRs. And we don't say that in a nostalgic way.

The a7 II isn't exactly a speed champion when it comes to processing speed, but it's a little more nimble than its 42MP cousin.

On a performance related note - the Auto ISO on the a7R II is far advanced over what the a7 II offers, with an adjustable minimum shutter speed threshold whose setting can be assigned to any custom button for quick access. This is great for adapting to changing subjects - biasing the camera to use faster shutter speeds for moving subjects, and slower ones (if necessary) for static ones. The a7 II generally just sticks to the 1/focal length rule - which may or may not at all be relevant for your subject, and doesn't account for the slower shutter speeds in-body image stabilization enables.