| Aperture | |
The aperture and shutter speed together are used to control the amount of light striking the film. This is crucial to get a decent result. Aperture also control the effective depth of field. This is the zone of sharpness that extends either side of the object that the lens is actually focused on. The smaller the aperture (but the higher the number!) the bigger the depth of field. Most landscape photography needs a large depth of field. Most portraits are taken using a small depth of field so the background does not distract from the subject. The actual aperture ypu use will depend on the size of the sensor/film you use. The larger the sensor the smaller the aperture needed for the same depth of field. An aperture of f5.6 on a 35mm SLR will give a small depth of field and is suitable for portraits. On a typical digital camera the same f-number will give a large depth of field. You will need to experiment to find out what works for you. |
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