With interchangeable-lens SLRs, the effective focal length of the lens depends on the size of the chip that is used in the camera. There are only a few SLRs with sensors that match the size of the 35mm film format. These are called full-frame sensors. These models do not magnify the effective focal length of a lens as cameras with smaller size sensors do. In most cases, the effective focal length is increased by 1.5x or 1.6x. This is good news if you mostly use telephoto lenses because it increases the pulling power. However, it is a disadvantage for anyone who prefers to work with wider focal lengths.
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