Bill,

On Wed, 18 Apr 2007 08:51:03 -0700, William "Chops" Westfield wrote:

> 
> On Apr 18, 2007, at 7:05 AM, Philip Pemberton wrote:
> 
> >>> But why is the prop not blurred?
> >
> > The blur is just
> > because the camera's panning to keep the plane sharp...
> 
> Effective panning speed is greater than prop tip speed?
> That seems ... unlikely.  Perhaps the stunt includes having
> the motor off  :-)

The prop's angular movement is pretty-much towards the camera, so its movement around its arc is small from the 
camera's point of view, while across the frame it's the same as the rest of the aircraft.  Fast-revolving objects can 
often look odd when photographed head-on - it's not uncommon for one propeller blade to appear heavily curved 
while that blade is moving in the same or the reverse direction as the focal-plane shutter, but another blade moving at 
right angles is almost straight, however from the side the movement is almost invisible.

Cheers,


Howard Winter
St.Albans, England


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