Add-on Lens - Some point and shoot digital cameras have a filter thread on the front of the fixed lens that will enable the attachment of an additional lens. Usually wide-angle or telephoto.
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AE - Auto Exposure. When the camera is set to this mode, it will automatically set all the required modes for the light conditions. I.e. Shutter speed, aperture and white balance. The 3 types are:
Program Mode. The camera will choose the shutter speed and aperture automatically, effectively making your SLR a "point-and-shoot". It will normally assign a shutter speed of 60th of a second or higher if possible.
Aperture Priority. You choose the aperture setting and the camera will automatically choose the shutter speed according to the lighting conditions. Best setting for controlling the depth of field.
Shutter Priority. You choose the shutter speed and the camera will select the correct aperture as long as there is enough light. Good for sports or action photography where you need control over the shutter speeds.
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AE Lock. This enables you to lock the current exposure reading and re-frame the shot using the same setting. A half-press of the shutter is normally required to activate this function, fully pressing only when you want to capture the image.
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AF. Auto Focus. All digital cameras and most modern SLR lenses have this function now. The lens automatically focuses on the subject as quick as the eye. The only difference is that with an SLR you can normally select manual focus if necessary.
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Aliasing. This is an effect caused by sampling an image at to low a rate. It causes rapid change (high texture) areas of an image to appear as a slow change in the sample image. Once this has happened, it is extremely difficult to reproduce the original image from the sample.
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Angle of View. This is calculated by the focal length of the lens and the size of the image sensor. The 35mm equivalents differ according to the sensor size.
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Anti aliasing. This is the process whereby you can reduce the "Stepping" effect on your images, by smoothing the edges where individual edges are visible. A great program for correcting this is Genuine Fractals by LizardTech. It is a plug-in for Photoshop.
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Aperture. The lens opening that allows more, or less light onto the sensor formed by a diaphragm inside the actual lens.
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Aperture Priority AE. When using this mode, the user selects the aperture giving control over the Depth of Field. A large aperture letting more light in gives a small depth of field, meaning not much will be in focus. Whereas a small aperture, not letting much light in, will give a greater depth of field or more will be in focus from the front to back of the image.
Archive. A collection of data in long term storage, usually the hard drive on your PC or an external hard drive.
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Aspect Ratio. The ration of horizontal to vertical dimensions of an image. For example, 35mm slide film = 3:2, TV = 4:3, HDTV = 16:9, 4x5 Film = 5:4.
Aspherical Lens. A lens with edges flattened so that it is not a perfect sphere. These produce a much superior image.
Automatic Exposure. The camera sets the shutter speed and aperture for the correct exposure according to the light.
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Automatic Focus. The lens on the camera focuses automatically when the shutter is half pressed. The viewfinder normally has focussing points shown to assist the user in knowing what will be in focus.
AWB. Automatic White Balance. Most digital cameras have this feature where the camera sets the white balance. Override is available in most DSLR's.
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