I know this is a very amateur-ish question but what can I do to limit the amount of light that my camera takes in when I'm taking a photo? I've been playing with my camera in manual mode and for example if I want to take a close up photo of a flower and have a shallow depth of field like using f2.0 it lets in a lot of light so then I adjust the shutter speed but it will only go as fast as 1/500 at f2.0. Is there something I can do to help not getting overexposed photos in the always too bright Texas sunlight?