Radar alert

[quk@sievers.com (Phil Payne)]

In message <m0vET1E-0008WkC@yage.tembel.org> shields@tembel.org (Michael Shields) writes:

> > A friend of mine living in Germany tells me that down there speed cameras 
> > are with flashes. So people hand CDs on their rear-view mirrors and the 
> > highly reflective surface of a CD blinds the cameras using their own flash.

> Yeah, and I heard that if you run a green marker around the edge it will
> also cause it to reflect radar.  C'mon, think about it.  Even assuming
> that the camera could be blinded by its flash, the CD would need to
> be angled in such a way that the flash reflected back into the lens.
> How does your reflector magically get into that alignment?

At certain wavelengths, a CD could have inteesting properties - it's 
essentially a circular diffraction grating.  I currently have my Metz 60CT2 
anti-aircraft flashgun on charge, and I shall take a few CDs out into the 
garden tonight.

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club