In Reply to: Anyone used speed camera flash diffusers ? (more) posted by Roy UK on March 31, 1999 at 10:59:10:
The photo-blocking lenses supposedly do work, but only to a certain degree. Car & Driver did an evaluation about 2 years ago, I'll try to dig it out.
Here's an easy test: Take two pictures of your car from an angle. See how well it works.
Interesting tidbit from MotorTrend:
..."englishman Alwyn Morris recently patented a device to counter this high-tech surveillance with photographic flash guns mounted on moving cars. According to the New Scientist magazine, the device uses the kind of slave flash guns that provide additional light for photographers. The slave senses when the radar flash gun fires and sends directly into the radar camera's field an echoing flash so bright it overloads the film and spoils the picture. So far, the Brits haven't figured out how to declare it illegal which offers hope for the US".
MT May 1999