Here is the manual for the Canon EOS R3

Canon Rumors Guy

Canon EOS 40D
Canon Rumors Premium
Jul 20, 2010
11,634
4,551
Canada
www.canonrumors.com
Last edited:
  • Like
Reactions: 2 users
I have a dumb question that I need to ask:

Why on the R3 is the buffer depth the same regardless if one writes to the SD Card or CF Express cards at 30 fps with the electronic shutter? For the R5 at 12 fps mechanical shutter there was a significant difference between the two.
 
  • Like
Reactions: 1 user
Upvote 0
Canon's Compatible Accessories information says the USB Power Adapter PD-E1 "Can only be used to charge battery packs. Cannot power the camera." But I'm pretty sure Gordon Laing's initial review said he was able to do a 6 hour video using a MacBook Pro USB charger.

Also, the official list of compatible Flash Units is shorter than I expected.
Edit: But the R3 Manual itself does say EL/EX series Speedlites can be used.
 
Last edited:
Upvote 0
I see Jared Polin got a production unit from Canon a few days ago and now the manual has been published. I wonder if there is any chance of the R3 starting to ship before 26th November, which in US is Black Friday so seems a strange date to start shipping on.
 
Upvote 0
Why on the R3 is the buffer depth the same regardless if one writes to the SD Card or CF Express cards at 30 fps with the electronic shutter? For the R5 at 12 fps mechanical shutter there was a significant difference between the two.

The camera buffer is fixed and is separate from the storage medium being written. Its depth does not change but the ability to clear it does depending on how fast the offloading is to the storage medium. The buffer will fill up faster with slow storage medium (SD) and clear faster with faster storage medium (CFX), and thus will appear to have a bigger "depth" with fast storage mediums.

It's probably a typo.
 
Upvote 0
It appears that the R3 only supports V60 SD cards, but not V90, and doesn't allow movies with SD cards at the highest data rates. That needs to be fixed! The Canon C70 uses SD cards and supports V90.
Are you referring to the chart on page 1021? I don't think that is saying V90 cards aren't supported, rather it says for those 4K options you need AT LEAST V60.
 
  • Like
Reactions: 1 user
Upvote 0
The camera buffer is fixed and is separate from the storage medium being written. Its depth does not change but the ability to clear it does depending on how fast the offloading is to the storage medium. The buffer will fill up faster with slow storage medium (SD) and clear faster with faster storage medium (CFX), and thus will appear to have a bigger "depth" with fast storage mediums.

It's probably a typo.
Your reply was my understanding as well. I do hope that it is a typo. Will hopefully find out in a few more weeks.
 
Upvote 0
You
Are you referring to the chart on page 1021? I don't think that is saying V90 cards aren't supported, rather it says for those 4K options you need AT LEAST V60.
You're right but it also says that high data rate video cannot be used with SD cards. The C70 not only supports V90 cards, it requires them at high data rates. The R3 may support V90 cards but their speed advantage is apparently lost. That's what upsets me.
 
Upvote 0