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>>165539 Digital cameras' sensors are, with a few exceptions, smaller than a 35mm frame of film. Therefore, a lens with a given focal length will act like a lens with that focal length multiplied by the crop factor on a less-than-full-frame digital.
Your K10D has a 1.5x crop factor, which means that a 50mm lens behaves like a 75mm lens would on a 35mm film camera in terms of field of view and perspective.
It's basically like taking a 35mm frame and cropping out just a chunk in the center, hence the term 'crop factor'.
In during ac posting a tl;dr.
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