First of all, we must know what P mode? Your camera is blind to the world and we must make many assumptions about this DSLR camera, including how many lights out there, where to focus, how fast the subject is moving and the ideal depth of field (or how much in front of and behind the subject should be the focus for example 2 meters in front of and behind the subject or. as much as possible). Switch the camera to P mode means the camera to make the best ‘guestimate’ It could be for all of the unknown.
Why is the amount of light that are important for your camera? Think of your own eyelids and how each of your eyes have iris. When it was a very sunny day you tend to squint and expand your iris to protect your retina. Conversely, in a dim room, You open your eyes as wide as possible and iris.

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