Most digital cameras, until you get into full-frame models, have a conversion factor. A 100mm lens will appear to be a 160mm lens when used on these cameras. I pulled a Pro Pointer out of World Impact Today that I hope will explain this adequately.
Pro Pointer
How does the conversion factor that I have heard about for some digital cameras affect lens performance?
Assume that you have a standard 50mm lens. On a 35mm film camera, the lens works as a 50mm lens. With expensive digital cameras that have full-size sensors the lens will work as a 50mm lens. It is when you buy a less-expensive digital camera that the conversion factor kicks in. If a digital camera is not a full-frame model, and most affordable cameras are not full-frame, you have to use a conversion factor of 1.6 for each lens.
A 50mm lens X 1.6 equals an 80mm lens. This means that your 50mm lens will magnify the image like an 80mm lens would on a full-frame camera. A 300mm lens would provide the same basic view of a 480mm lens.
All you have to do is take your lens size and multiply it by 1.6.
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