Re: Camcorders and IR sensitivity

["Lee S. Kilpatrick (Mr. Breeze)" <leekil@xxxxxxx>]

> This weekend I ran some tests using video camcorders and Hoya R72 IR filter
> over the lens. The results were surprising:both cameras showed a
> distinctive IR response! The camcorders are both older models made around
> 1988. The models and their results are listed below. I don't have specific
> info on the type of CCD chip used, but it must have been common ten years
> ago.


I believe that videocameras commonly have an IR response, at least for
some limited range.  I have a Sony camera from 1994(?) that has some
response.  The way I discovered this was when I noticed that it could
detect the infrared beam from a television remote control.  The
infrared LED shows up as a bright blue on the videocamera image.  I
assume that this is a common response for electronic camera CCDs, as I
also saw a picture on the web a few months ago taken with a digital
camera that seemed to show the same response.  The photo was taken for
some other illustrative purpose, but it showed a burner element on a
stove, and the burner had a blue glow similar to the remote control
beam.  The web page author commented on the weird effect, but didn't
really have an explanation.  I can't find that page now, but I believe
it was taken with a Kodak digital camera (though I expect that many
would exhibit similar behavior).


	Lee
*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************

------------------------------