Canon EOS R6 Mark II Buffer Depth and Burst Speed Test

The Canon EOS R6 Mark II shoots at up to 40 frames per second with its electronic shutter, a figure that means nothing if the buffer chokes before the moment passes. Testing the buffer means filling it with a controlled burst and counting how long the camera sustains full speed before it throttles, then timing how quickly it recovers with a fast card.With a UHS-II SD card the body holds its top burst speed for a shorter window than spec sheets imply, because the write path becomes the bottleneck almost immediately. Switch to a fast CFexpress card and the buffer clears far faster, extending the practical burst and shrinking the wait between sequences. The difference is stark enough that shooting this body on SD alone leaves a meaningful part of its capability on the table.Raw files stress the buffer differently than JPEGs. A raw burst fills the pipeline in seconds, while JPEG bursts can run long enough to feel effectively unlimited on a fast card, and C-RAW offers a middle ground that many shooters overlook.

The electronic shutter adds its own caveat, producing rolling shutter on fast pans that the mechanical shutter