[pure-silver] Re: New b&w film - Rollei R3
- From: Brian Reynolds <reynolds@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 6 Oct 2004 09:20:39 -0400
Richard Knoppow wrote:
> Traffic film is used in those cameras which record
> people going through stop lights, etc. It is IR sensitive so
> that invisible IR flash can be used. This is partly so that
> violators are not tipped off but mostly to avoid distracting
> other drivers with powerful flashguns going off.
In NYC the red light cameras have a very visible flash of light when
they go off. They are set up to only trigger when they sense a
vehicle in the intersection while the light is red. I've always
assumed that the visible flash was sort of a "Aha! We got you!" notice
to the drivers in the intersection. I'm not even sure that the flash
is for photographic purposes (i.e., I think that the camera itself may
be IR based like everyone else uses).
--
Brian Reynolds | "It's just like flying a spaceship.
reynolds@xxxxxxxxx | You push some buttons and see
http://www.panix.com/~reynolds/ | what happens." -- Zapp Brannigan
NAR# 54438 |
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