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what are benefits
The (rather dubious) term "full-frame" refers to the size of a DSLR's image sensor relative to the frame size of the once-most common analog photographic medium:35mm film. A "standard"35mm film frame is24mm high and36mm wide, give or take a few tenths of a millimeter. When the first DSLRs started to become attainable to regular consumers outside of major news outlets in the early2000s, people who had built entire systems around their35mm film cameras suddenly found themselves having to readjust to the smaller sizes of the sensors found in early DSLRs: long lenses became even longer, and wide-angle lenses weren't that wide anymore. the ensuing outcry by many enthusiasts and professionals prompted manufacturers to look for ways to develop sensors that approached the frame size of the venerable35mm film while still maintaining image quality (which they eventually did, more or less,) and hence the term "full-frame sensor" (as in "the size of a35mm film frame") came about.
Full frame camera is much larger than the cropped sensor camera. The benefits of full frame is its image quality. It produces a much higher quality images compared to APS-C sensor. and it tends to have a much bigger image size.