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Photography

Photography

Common Photography Terms

Aperture: This is referred to the lens diaphragm opening inside a photographic lens. The size of the opening regulates the amount of light exposing your image. The size of the opening is controlled by the f-number (1.8, 2.0, 2.8, 4.5, 5.6, 8.0).

Image Stabilization (IS): You will most commonly see the letters IS or the words Image Stabilization attached to a lens name. For example: Canon EF 28-300mm f/3.5-5.6 L IS USM Lens. A lens with Image Stabilization will allows you to shoot at a lower shutter speed and still retain a sharp image. For example, you can often achieve the same results as shooting 1/200 with a regular lens, as shooting 1/20 with a lens with IS.

UltraSonic Motor (USM): The USM is Canon lens feature that is essentially a small motor within your lens that allows your lens to achieve a faster automatic focus. A Canon lens with a USM installed is generally more expensive and heavier.

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