Nikon D850 does not work with all CFexpress cards but works well with Sony Tough series cards. I tried 5 cards from 4 different manufacturers, only 2 of them worked in my camera. Here's a table of how many frames I was able to capture in a 7fps burst before the framerate dropped due to a full buffer (lossless compressed RAW file format): map ----------- 14 -bit ---- 12bit Manfrotto CFe 42 70-90Sony Tough CFe 63 200 (camera limited) UHS-II SDXC 28 48 cards that DID NOT WORK in my camera: Ritz VideoPro128GB CFexpress (probably renamed)Integral Ultima Pro X2 CFexpress
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