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Friday, March 27, 2009

How A Film Camera Works

By Don Bethune

The lightweight, compact Canon PowerShot A590IS is an 8-megapixel model. Its 4x optical zoom lens and impressive focal length (which is equivalent to a 35mm cameraas 35-140mm) provide for clear photos. The A590as face recognition technology zeroes in on the subject and keeps it in focus and the 2.5-inch screen allows for easy viewing. This model has a strong set of features for an entry-level PowerShot.

The A590as image stabilizer (IS) compensates for small movements, or acamera shakea and compensates within the lens element. This capability allows the camera to create a much sharper picture at a low shutter speed, a feature not available on cameras without IS.

The A590as manual provides all of the details about the camera. The 2.5-inch LCD screen has 115,000-pixel resolution and a visual viewfinder. The back of the camera (where the screen is located) also includes buttons for a variety of other functions on the camera.

With a traditional film camera, the shutter opens and closes very quickly, allowing only a miniscule amount of light to reach the film. When the light contacts the film, it creates a reaction in the light-sensitive chemical in the film.

The amount of light allowed in by the shutter has a large effect on the changes to the light-sensitive material on the film. If the shutter allows in too much light, the film is aoverexposeda, causing too many of the light-sensitive elements to change. When this happens, there is not enough difference between the lighter and darker parts of the picture for the photo to be clear.

The grains of the film are permanently changed by the chemical reaction of the light hitting the film. Besides those already mentioned, a wide variety of other features are also a part of the .PowerShot A590. The lensas focal length has an effect on how big the picture appears on the cameraas screen.

A longer disclosure permits extra brightness, and a shorter disclosure permits smaller amount brightness. The iris proceeds to decrease the quantity of brightness, and it also influences the spotlight. This is known as 'field of focus'. A lesser orifice in the iris creates a larger field of spotlight, letting object nearer and further than away from the real point of spotlight to appear sharper.

The camera has a meter that measures the brightness of the area being photographed. The camera is able to manage the lens, shutter, and opening depending on the amount of brightness detected. The process of creating a quality picture is thus automated, allowing the photographer to concentrate on the subject.

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