EB-1 wrote:
I don't think it is the AF motor, but the communication (SP1) ran at different speeds in the past.
It's pretty amazing that we can use the IS II and other 10+ YO lenses at 40FPS. Canon was very forward thinking with the EOS system.
EBH
That is a great bit of history. I hadn't realized the protocol itself had a "generational" name like SP1 but it makes perfect sense. It’s a testament to Canon’s engineering that a lens designed in the "SP1" era can still talk to a 2024 DIGIC Accelerator/DIGIC X dual-processor system at all,let alone track a subject at 20fps.
The fact that the 400mm f/2.8L IS II (a 14-year-old lens) can hit 40fps is definitely "forward-thinking" at its best. It makes the transition from my 5Ds R (a 11-year-old body) much less painful knowing I don't have to replace my entire "Big White" collection just to see a massive performance jump.
rscheffler wrote:
A downside of huge cards, and filling them with tens of thousands of images, is that it can affect certain aspects of camera performance. Start up and ready time can be delayed because the camera 'polls' the cards to determine the contents and available space. The more files on a card, the longer this will take.
Does it make a difference if you start a new folder every thousand or so images instead of letting the one folder get to 9999 images? I imagine that it needs to find all the files in the folder currently being written to in order to find the next available sequence number.
It doesn't make a difference, from my experience. One of the high volume things I shoot is youth sports tournaments, for which I make a new folder for each game. There can be 40+ folders on the back-up card by the end of the day.
I think the way the file system works is that files are written to wherever there is space and are tagged by the file system as contained in a given folder.
Canon was very forward thinking with the EOS system. 