Canon EOS 250D Advanced User's Manual page 148

Shooting Tips
Change the ISO speed. Use the built-in flash.
z
To match the subject and ambient lighting level, you can change the
ISO speed (= 118) or use the built-in flash (= 169).
Change the program using Program shift.
z
After pressing the shutter button halfway, turn the <6> dial to change
the shutter speed and aperture setting combination (program). Program
shift is canceled automatically after the picture is taken. Program shift is
not possible with flash.
Differences Between <d> and <A> (Scene Intelligent Auto)
In the <A> mode, many functions, such as the AF operation and metering
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mode, are set automatically to prevent spoiled shots. The functions you can
set are limited. On the other hand, with <d> mode, only the shutter speed
and aperture are set automatically. You can freely set the AF operation,
metering mode, and other functions.
If the "30"" shutter speed and the lowest f/number blink, it
z
indicates underexposure. Increase the ISO speed or use
flash.
If the "4000" shutter speed and the highest f/number blink, it
z
indicates overexposure. Decrease the ISO speed.
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