![]() By discarding some of the peripheral areas of the lens, it ends up appearing as though you’re using a longer focal length. This is because the sensor is not large enough to take advantage of the lens to the same extent as a full-frame sensor can. A camera with a sensor that’s smaller than full-frame may be used with a lens that has a focal length of 18-55mm, but in reality the effective focal range you’ll end up with is closer to 27-82mm. To make things easier to understand, manufacturers often provide an ‘equivalent’ focal length, which uses the full-frame sensor as its reference point.Ī 18-55mm lens used on a camera with an APS-C sensor has an effective focal range of 27-82mm, although the exact length depends on the camera used. The problem here is that different lenses marked with two completely different focal lengths may provide the same effective focal range to work with when used on the bodies for which they are designed. Whether they're built into the body of a camera or supplied separately, lenses are marked with their actual focal length, rather than the effective focal length when used on a particular camera. ![]() But with interchangeable-lens cameras like DSLRs and mirrorless cameras, any lens used needs to be able to have an image circle – the diameter of the light that exits the lens – that can sufficiently cover the dimensions of the sensor. If you buy a compact camera the lens is built into the body, so there's less to think about here from a buying perspective. The size of the sensor inside a camera has a direct effect on what kind of lenses can be used with that camera.
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