Jinx wrote:
>> But why is the prop not blurred?
> 
> If you look very closely it is
> 
> Assuming 1m blades @ 2500rpm, gives tip speed of 131m/s. 5cm
> blur would be 382us shutter speed
> 

Which is 1/2617.8 of a second. The nearest shutter speed to that is probably 
1/2000, which is completely plausible in bright sunlight with the aperture 
almost completely open.

One thing's for sure, the photographer was either very close, or had a VERY 
good lens. I don't think even the Canon L-series glass is that sharp fully open...

And at that sort of speed, IS would be utterly pointless. The blur is just 
because the camera's panning to keep the plane sharp, but because the people 
are static they're getting blurred (because the camera's moving). It's an old 
trick, but it works well.

*removes 'photography geek' hat*

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