"Mark IV" on its own just means the fourth version of something: there's also a Canon 1D Mark IV (though it isn't quite full frame) and a Sony a7R Mark IV (which is full frame), for example. Not finding to many people comparing the two together and probably for that reason. Definitely many assume the full frame option is the best, and don't The Canon EOS 1D X Mark III is a powerful and versatile camera that is perfect for professional photographers and videographers. It features a 20.1 megapixel full-frame CMOS sensor and a DIGIC X image processor for stunning image quality and fast performance. It also has a 61-point AF system with up to 41 cross-type points for precise autofocus. 1) Canon's website says you cannot use EF-S lenses on anything but the Rebel series and the XXD series, which use an APS-C sensor. I was aware of this. However, I've seen on several websites, the 1D Mk IV advertised with the 17-55, which is, according to Canon's website, an EF-S lens. The 1D Mark IV is an EF mount camera with an APS-H size sensor. This sensor has a 1.3 crop factor, so it is smaller than a full frame sensor like the 1Ds, 1D X, 5D or 6D has, but larger than the 1.6 crop factor in the 7D series, XXD series or Rebel series (in the US), or XXXD or XXXD series in Europe and Asia. In the case of Canon EOS 1D Mark III the cropping factor is 1.3x, a bit less than 1.6 above, because here the the APS-H sensor is not that much smaller (about 30% smaller) than the Full frame. Crop factor = Perceived focal length extension. Since we get the effect of zooming when the sensor becomes smaller, we talk about focal length extension. However, the 1D Mark IV’s APS-H sensor size is smaller than the full-frame sensor in the 5D Mark III, which may affect the overall image quality. Taking these factors into consideration, the Canon EOS 5D Mark III is the superior choice in terms of optics due to its higher resolution, more advanced processor, better sensor performance, and P8dPR.
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    • canon 1d mark iv full frame