Re: 580EX II Zoom Range
The flash is adjusting to the FOV of the lens, not the FOV of the sensor. That guarantees that FOV of the lens is covered, and not clipped just a bit. Standard flash, lens compatabiliy since zoom flash heads have been made.
Now if you want to pay around $1000 for the same flash that will calculate for a FF, 1.3 crop, 1.6 crop, 1/1.7, 1/2.5 or any other sensor size that Canon cameras use that will accept an external flash. And you can guarantee sufficent sales of the units at that kind of price that Canon will make a profit, then I'm pretty sure that they would build it.
It's a matter of economics. As grsphoto said, a 35mm is a 35mm no matter what body you put it on. Makes it easy for the flash to sync with the lens.
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