Techniques and Process 1A – evaluation on Aperture

(Research found in Outcome 1, page 1,3,4 )

From my research sources i now know that…

The Aperture is the size of the opening within your lens which light passes through, it can be changed in size, larger or smaller. This controls the amount of light which passes through the lens and is measured in f-stops. The most common f-stops are… f2.8, f4, f5.6, f8, f11, f16, f22, f32. However the range of aperture depends on the lens you are using, it can go even higher and even lower. There are small and larger apertures, f2.8 is a larger aperture but a small f-stop whereas f22 is a small aperture but a larger f-stop.  So the larger the f-stop the less amount of light passes through the lens. Decreasing the aperture by one whole f-stop will let in 50% less light. Apertures can also be measured in whole stops, half stops and third stops due to technical improvements. If your camera works through half stops or third stops you must make sure you compensate in whole stops correctly otherwise your image may end up over or under exposed.
Aperture is also linked to shutter speed. When you change your aperture by one stop you must change your shutter by one stop. You must do this because the two work together to control the exposure of the image.
Changing the aperture also results in the depth of field of an image. Depth of field is the area of the photo which is in focus. Smaller apertures such as f22 will result in a greater depth of field.  Aperture also controls of the bokeh of the image the blur. Larger apertures such as f2.8 will heavily blur the background of the image.


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Olivia Bates

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