Crop-factor is a term used in digital photography to describe the apparent magnification of a lens when used on a camera with a sensor smaller than the traditional 35mm film format. It is a ratio that compares the size of a camera's sensor to the dimensions of a 35mm film frame. This ratio affects the effective focal length of a lens, making it appear as if the lens has a longer focal length than it would on a full-frame camera. For example, a camera with an APS-C sized sensor, which is smaller than a full-frame sensor, will have a crop factor of around 1.5x. This means that a 50mm lens on an APS-C camera will have an effective focal length of 75mm, resulting in a narrower field of view and greater apparent magnification. Crop-factor is an important consideration when selecting lenses for a camera system, as it affects the perspective, depth of field, and overall composition of an image. It is also a factor in calculating the effective aperture of a lens, which influences the amount of light reaching the sensor and the depth of field. Understanding crop-factor is crucial for photographers to make informed decisions about their equipment and to achieve their desired creative vision.
Crop sensor, APS-C, Micro Four Thirds, focal length, field of view, lens selection, sensor size
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