Just go outside on a sunny day and start shooting whatever's
nearby. And aren't I glad that this is a camera thread to give
context to that sentence... Anyway, you want to understand the
relationship of three things, represented with different
numbers: Shutter Speed, Aperture, and ISO. Changing either one
of them will affect how bright/dark your images are, AS WELL AS
one other "side effect" unique to each choice. All three affect
each other and you will eternally balance with them. -Your
shutter speed seems intuitively obvious: How long your shutter
is open, or rather, how long your sensor is exposed to light.
Measured in fractions of a second, or whole seconds or even
minutes for really long exposures, but for walking around
holding the thing in your hands, you're going to want numbers
like 1/50 or 1/100, or even 1/1000 or 1/2000 in broad daylight.
SIDE EFFECT: Shutter speed is also what you use to freeze
motion. Something moving very fast will still be blurry even at
1/100th of a second. At 1/4000th, howev