Aperture is a hole within the lens which lets light travel through into the camera body – the size of this hole controls the amount of light let through and the depth of field. Depth of field is what controls what is in focus and what is blurred. A small aperture (f22 – f11) - means that the depth of field will be large and a large (f2.8 – f5.6) aperture means the depth of field will be small. A larger aperture also lets more light in, while a smaller aperture lets less light in. A small aperture is useful in high light situations in which you want only the image in the foreground to be in focus. Using a large aperture in high key lighting situations means the image can be under exposed, but the entire image will be in focus. I you want to use a larger aperture in high key lighting situations you should lower the ISO, or lower the shutter speed if you have a tripod.
Shutter Speed: 1/40 F4.5 ISO: 200
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