Is there a way to get the Canon DSLR driver to trigger capture without downloading the image? It can be set to save to the camera's internal storage, but I can't see a way to get it to not also download the frame.
With the Canon R5 download is taking me about 2.6 seconds over USB3, so with 5 second frames I lose more than 30% of light gathering time. I've been having the camera capture on its own by holding the shutter release via a cable, but when I tried to have the driver handle it I got far fewer frames even with dithering off.
I tried this and worked well. I had one issue is when a meridian flip was ready, the camera driver could not stop taking images and prevented the meridian flip. Once I stopped the capture it then carried out the flip. I had no indication that this was fixed or not.
Maybe test it just on the verge of a MF and see if it works.