Aperture and ISO

Aperture settings
The size of the aperture on a camera lens changes the amount of light let in. A big aperture lets in a lot of light and is good for dark conditions, a small aperture lets in little light and is ideal for bright conditions. Aperture setting can change the depth of field in images; the amount that is in focus.
The above images were taken with differnt F stop settings to change the depth of field. The first image was taken at F5.6, meaning the foreground is in focus but the background isn't. The second image was taken at F11, making the background look slightly more focused. The last image was taken at the highest aperture setting of F36 so both the foreground and background were in focus.

ISO Settings
Changing the ISO settings affects the amount of grain or noise in an image. The higher the ISO, the more grainy an image will be. The first image was taken with the ISO settings at 100, the second at 3600.