ConversionFactor
First we should discuss Conversion Factor, also called Crop Factor and Focal Length Multiplier (FLM), and what it means. The sensor in the Sony A200 is smaller than that of a 35mm camera, so lenses have a different field of view than they have on a 35mm camera. To get the equivalent, just multiply the focal length of the lens you have mounted by 1.5. The focal length of the lens is always the same, regardless of the sensor or film size, but the reason we bother with a conversion factor is partly historical and partly thanks to the many sensor sizes on the market.
Most of us who have taken pictures with a 35mm film camera are familiar with how our various lenses performed at that film size. A 28mm lens, for example, ...
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