![]() The A7R III clears its buffer much faster than the earlier A9, and doesn't cripple the camera nearly as much while it's writing to the card, but the D850 simply blows it away when it comes to total shots over time. Here are some numbers from our performance testing: With the optional battery grip, it shoots 90% as fast as the A7R III, and yet still clears its huge buffer much more quickly. ![]() While it's "only" shooting at 7fps out-of-the-box, the D850 has a seriously deep buffer, and clears it unbelievably quickly. (Note, though, that a lot also depends on how efficiently a camera is communicating with the card just because a card is capable of writing at ~300 MBps doesn't mean a particular camera will be able to hit that rate.) (Oddly, while Sony was one of the founding companies of the XQD format, they haven't chosen to use it in any of their still cameras, even very high-performance ones like the A9 and A7R III.) XQD cards are a lot more expensive than SD cards, but they leave even the fastest SD cards in the dust when it comes to write speeds. The enormous advantage with the D850 lies with its support of the super-fast XQD memory card format. On the face of it, it seems that the A7RIII is the faster camera, but the (huge) difference comes when you look at buffer clearing times, and how many shots you can actually take over the span of several minutes. The D850 is capable of a nearly-indistinguishable 9 fps but requires the addition of a $400 battery grip to do so. It can rattle off 10 fps bursts, while the D850 seems relatively plodding, at "only" 7fps. ![]() ![]() This may seem like an odd call, given that the Sony handily wins when it comes to out-of-the-box continuous-mode frame rate. ![]()
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