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Originally Posted by
Daniel Browning
The 5D2 frame rate is limited by mechanics. Wear and tear is something like the cube of the speed of the two parts. If the 5D2 (4 FPS) was as fast as the 7D (8 FPS), that's 16 times more wear and tear. That means Canon would have to build it 16 times better, or it will break 16 times sooner.
Furthermore, the mechanical frame rate is affected by the size of the mirror. Vibration goes up with the fourth power of mirror height. That gives the 5D2 five times more vibration at the same frame rate, another source of engineering difficulty.
It would be nice if Canon came out with an answer to Nikon's D700, but it would be a real change in pricing strategy.
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