A full-frame camera is the standard; it has no crop factor. An APS-C sensor (also known as a crop sensor), has a crop factor of 1.5x (on Nikon and Sony cameras) or 1.6x (on Canon cameras). The Micro Four Thirds crop factor is even stronger: 2x. As I explained above, the crop factor affects your field of view. Look at the series of images below
Full-frame is the standard in photography for comparing crop factors of different types of sensors. Medium format cameras, on the other hand, equip a larger sensor size compared to a 35mm full-frame digital sensor. Any camera that features a sensor larger than the 36×24 mm and smaller than 100×130 mm is a medium format camera.
Cheap lens on full-frame vs. my best lens on DX. (roll your mouse over) Above are crops from much larger images at 100% shot on my Canon 5D full-frame with a 20-year old Canon EF 70-210mm f/4 zoom lens and shot with my very best lens in this range, my Nikkor 85mm f/2 AI-s, on my DX D200. If you printed the complete images at this magnification
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difference between full frame camera and crop sensor