[URL]http://www.actionimports.com.au/photo.htm[/URL]
Well the number plate itself is highly reflective, so any crappy camera with a flash would produce that effect. You want to trust your licence to it? Moike
I recall several years ago there was a trade stall doing the rounds of the bike (and car) shows selling 'anti-camera' number plates, they were at the NEC for the Bike Show and Performance Bikes took a snap of the stall with their own high powered flash gun - result? Every one of the 'stealth plates' totally legible. Also, not sure about the various States/Territiories but UK law has a nice little catch-all called "perverting (or attempting to pervert" the cause of justice"; in other words trying to do something to allow you to get away with an illegal act is, in itself, illegal and actually punishable as a higher offence. Not that I'm saying someone wouldn't want to give it a go and try spraying stuff on their plate as a *ahem* protective coating.... Me? I just used to have a nice shiny bike with the dirtiest numberplate in all christendom. They'll pull you over for that but not do you. Another one that was handy on the Speed Triple was a rag stuffed into the tailpiece and (oh dear) it just happened to have slid out part of the way so that it dangled over the plate - ok it waved about in the wind but mates following me said that it did cover a portion of the plate and unless they could prove within reasonable doubt that the registration matched your bike on camera (a snapshot remember, not a pursuit) then the case would fall over. Cheers, Jeffles
so, all you need then is a polarised filter on your number plate at 90 degress to camera's filter then? all we have to do it work out which way they have their filters. which could be one of 360 deferent angles mh
Crap Given that polarising filters are used to reduce the glare from reflections at high angles of incidence from flattish surfaces, how does the polarising filter on a speed camera reduce the glare from a flash that is pretty at much the same lowish angle angle of incidence as the camera? Given that the light is reflected mostly from the embedded glass beads in the plate, so that the light would be reflected from a wide range of internal surface orientations, a polarising filter would have about the same effect as tinted glass. (I don't believe it works, but I don't think polarising filters have anything to do with it.) Moike
For what it's worth: A mate and I got some of this stuff (a lot cheaper than $60) and tested it, using a fairly old Mavica digital camera. Several pictures were taken, with and without flash. The number plate was completely illegible when flash was used, even in broad daylight. When no flash was used, on a cloudy overcast day, the number was partially obscured.In bright sunlight it would probably have been even less legible. Some of the pictures using flash were of my bike, parked under a tree to simulate low light. Oyjhers were of a car number plate, taken from the rear. The number plate on the car parked beside the test vehicle was as clear as crystal, so the flash didn't create the same effect on an untreated plate. To sum up, no I wouldn't trust my licence to it, but as an extra line of defence against the money-grubbing scum, it can't do any harm. Jimi. Try this: http://www.photoblocker.com.au/ PS I think I've still got the pictures somewhere, if anybody's interested.
enough? neither did I...year 10 physics. you would only have to rotate your filter 180 degrees to work out which way they have their filter ....but their filter could any of the 360 degrees I fink that's right?? mh