Yep, the 200 shot series is a limitation in the camera to prevent that you put your camera in a bag and it burns through your card, taking a thousand shots because something is pressing the shutter....
I have been on the horn with Nikon today, and by resetting the D850 to complete standard, I am finally getting the expected performance numbers.
Without the battery grip, at 7fps, RAW only onto XQD, large, lossless compression, 14-bit, I get 50/51 shots in the buffer. D-Lighting and Long Exposure NR is OFF, ISO has to be under 3200, and no distortion control. All of these things affect the buffer size. They confirmed this is true with all the XQD cards they have tested with, and that the Sony G series is amongst the absolute fastest available.
The second you add the battery grip and EN-EL18, the 9fps means the buffer fills up faster and hence it only holds around 36/37 shots, before it starts slowing down. It is like someone said, pure math.
They are working on getting better performance on the faster cards, but that'll be in a future FW.
Thanks Killerbob for the undate! I use distortion control and a slower SD of x300 speed so I am sure it is affecting my D850 like yours. Might be time for me to reset mine to factory settings as well...
"Buffer size" in first years of digital photography used to indicate no of continuous shots one could take REGARDLESS of what speed card he used which was the true meaning of buffer - the available memory in the camera. These days, the term is used for the number of shots that can be taken WITH the fastest / ultra speed card available which gives room to manufacturers to play with figures and get away with excuses.
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I just wish I was good enough to use one.