Aperture
'F' numbers or 'F' stops are associated with aperture and they affect exposure and depth of field.
Wide angle lenses produce a generous depth of field (the whole image is in focus) whereas telephoto lenses produce a shallow depth of field (background is thrown out of focus)
Exposure is affected by the aperture size due to the amount of light entering so shutter speed needs to be adjusted accordingly to avoid over-expose or under-exposure. A wide aperture allows lots of light in so the shutter speed will need to be fast.
A typical aperture sequence:
f2 f2.8 f4 f5.6 f8 f11 f16 f22
Each f stop allows in 2x as much light as the last
Wide angle lenses produce a generous depth of field (the whole image is in focus) whereas telephoto lenses produce a shallow depth of field (background is thrown out of focus)
Exposure is affected by the aperture size due to the amount of light entering so shutter speed needs to be adjusted accordingly to avoid over-expose or under-exposure. A wide aperture allows lots of light in so the shutter speed will need to be fast.
A typical aperture sequence:
f2 f2.8 f4 f5.6 f8 f11 f16 f22
Each f stop allows in 2x as much light as the last
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