Canon EOS 250D Advanced User's Manual page 467

Shooting-Related Problems
The lens cannot be attached.
The camera cannot be used with RF or EF-M lenses (= 47).
z
No images can be shot or recorded.
Make sure the card is properly inserted (= 37).
z
Slide the card's write-protect switch to the Write/Erase setting
z
(= 37).
If the card is full, replace the card or delete unnecessary images to
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make space (= 37, = 310).
You cannot take a picture when focus indicator <o> in the viewfinder
z
blinks during focusing with One-Shot AF. Press the shutter button
halfway again to refocus automatically, or focus manually (= 50,
= 111).
The card cannot be used.
If a card error message is displayed, see = 38 or = 477.
z
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
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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 <AF> (= 47).
z
Press the shutter button gently to prevent camera shake
z
(= 49–= 50).
With a lens equipped with the Image Stabilizer, set the IS switch to
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<1>.
In low light, the shutter speed may become slow. Use a faster
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shutter speed (= 149), set a higher ISO speed (= 118), use flash
(= 169), or use a tripod.
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