Aperture/ Depth of Field

Aperture relates to the size of the whole/ diaphragm in the lens, this is measure in units called f stops.. The lower the number the wider the aperture (for example f1.8) therefore allowing lots of light in through the lens compared to a small aperture of f22 which restricts the amount of light being let in. When taking photos or videos, the aperture also determines the depth of field, for example: a wide aperture of f2.8 creates a shallow depth of field, isolating the subject making the background look blurred. Conversely a small aperture of f22 for example has a deeper depth of field making the whole image in focus.