Canon EOS 5D Mark III vs 6D: 05 ISO range
Usually, you would expect a cheaper, ‘consumer’ camera to offer a smaller ISO range than a professional model, but the EOS 5D Mark III and EOS 6D have an identical ISO range. Both go from ISO 100 to 25,600, with an option to expand the range downwards by 1EV to ISO 50 or upwards by 2EV to ISO 102,400.
Canon EOS 5D Mark III vs 6D: 06 Shutter speeds
The shutter speed range is another area where you’d expect the professional camera to have an advantage, and the EOS 5D Mark III has a top speed of 1/8000sec compared to 1/4000sec on the EOS 6D. There won’t be many occasions where this shutter speed advantage will be significant, but pros may well want to have it available just in case.
The flash synchronisation speed on the EOS 6D is 1/180sec, and the EOS 5D Mark III’s is fractionally faster at 1/200sec – though you have to be using one of Canon’s own EX Speedlite models to gain this small advantage.
Canon EOS 5D Mark III vs 6D: 07 Continuous shooting
Both cameras use Canon’s DIGIC 5+ processor, but there is a difference in their continuous shooting speeds and buffer capacities, which is due as much to the hardware in the camera as the speed of the in-built processor.
The EOS 6D can shoot at a modest but acceptable 4.5 frames per second and can capture 1250 JPEG files in a row or 17 RAW files (with a UHS-1 memory card). The EOS 5D Mark III can shoot at 6 frames per second and capture 16270 JPEGs or 18 RAW files (with a UDMA memory card).
The difference in the continuous shooting speed is significant for action photographers, though the buffer capacities are similar – both can shoot more JPEGs in a row than you’re likely to need, and the real limitation is the maximum number of RAW files – neither camera is particularly strong here.
Canon EOS 5D Mark III vs 6D: 08 Viewing
Both cameras use a 3.2-inch fixed (non-articulating) 1040k-dot rear LCD, and both use pentaprism viewfinders rather than cheaper pentaprism designs. But where the EOS 6D’s view finder displays 97% of the frame, the EOS 5D Mark III’s viewfinder shows a full 100%.
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