Canon EOS R3 Advanced User's Manual page 979

Shooting-related problems
The lens cannot be attached.
To attach EF or EF-S lenses, you will need a mount adapter. The camera cannot be
used with EF-M lenses (
No images can be shot or recorded.
Make sure the card is properly inserted (
Slide the card's write-protect switch to the Write/Erase setting (
If the card is full, replace the card or delete unnecessary images to make space
( , ).
Shooting is not possible if the AF point turns orange when you attempt to focus. Press
the shutter button halfway again to refocus automatically, or focus manually (
The card cannot be used.
If a card error message is displayed, see
An error message is displayed when the card is inserted in another
camera.
Since SDXC cards are formatted in exFAT, if you format a card with this camera and
then insert it into another camera, an error may be displayed and it may not be possible
to use the card.
The image is out of focus or blurred.
Set the lens's focus mode switch to <
switch, set [
Press the shutter button gently to prevent camera shake (
With a lens equipped with an Image Stabilizer, set the Image Stabilizer switch to
< >.
In low light, the shutter speed may become slow. Use a faster shutter speed (
higher ISO speed (
I cannot lock the focus and recompose the shot.
Set the AF operation to One-Shot AF (
possible with Servo AF (
).
: Focus mode] to [
), use flash (
).
).
Inserting/Removing Cards
> ( ). For lenses without a focus mode
].
), or use a tripod.
). Shooting with the focus locked is not
979
).
and Error Codes.
).
, ).
), set a