Canon R7 real-life continuous shooting fps?

mcantsin wrote:

Question to R7 owners: The Canon R7 is specificied with a maximum of 30fps in continuous shooting, with a maximum of +/- 90 frames in CRaw. But does the camera drop to lower fps at shutter speeds in the range of 1/60-1/500?

My experience with other high-speed cameras - such as the Sony A9 - is that the advertised continuous fps values exist more in theory than in practice, because shutter speed needs to be added to the overall timing. If this should also be the case with the R7, it would mean that at 1/60 shutter speed, the actual frame rate would drop from 30fps to 20fps.(*)

But I am not sure whether the R7 really has the same behavior.

Are there users of the camera here who know more?

(*) Twenty times 1/60 second amount to an additional 1/3 second, leaving only 2/3rds of the theoretical maximum of 30 fps. Or, in other words: the equation is 1/(1/60+1/30)=20. Of course, that frame rate would increase with shorter shutter speeds. For example, at 1/500, it would be 1/(1/500+1/30)=28.3.

I don't have time to measure this right now, but there is no impact of exposure time on burst speed at all around 1/1000, because I did a 30fps burst on the R7 and the EXIF's timings were 30ms - 30ms - 40ms - repeat through the whole burst except at the very end where the camera had to check free buffer space, I guess.

RAW Burst Mode allows the shutter speed to go down to 1/30, but I haven't tested if that slows the burst, but I get the impression that Canon wants it to be like a RAW movie segment. Perhaps the other camera had some issue where it had to complete reading the last row of pixels before beginning exposure of the next frame, but that isn't a universal issue, I think, as exposure can be started in a row of pixels anytime after the closing electronic curtain reads that row out in the previous frame.

Depending on camera and mode, AF or metering could be culprits, too, but I think most systems are more parallelized these days and one subsystem doesn't have to wait on the others.