The price of 48100 is written here - in Hong Kong you will not find it anywhere for so much. The kit costs 80,000, the bodysuit is 15k cheaper. A crop factor of 1.6 is very positive at tele-distances. Increases the "look" distance of the telephoto lens. And at wide angles, of course, FF is very useful. Like all Canon devices, except for the 1000D and 450D, it does not tolerate soapy optics.
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