[Noisebridge-discuss] IR Blocking filter material?

[David Yao]

The camera is a little bullet-style video security unit, like from
http://www.supercircuits.com . So it's not a normal consumer camera, and I'm
pretty certain the one I have is intended to work under IR illumination.
However, I'm using it for a helmet-cam, not indoor or night use, so i'm
willing to give up a lot of night low-light performance to get more vivid
day-time footage. It might be a 1/3" sensor, I can also probably fit up to a
~3/4" diameter disc in the housing in front of the lense.

So if anyone has a dead digital camera or the like, I'd like to get my hands
on it.


On Wed, Jun 10, 2009 at 12:46 PM, Jonathan Foote <jtfoote at ieee.org> wrote:

> Unless for some reason you are using something specifically designed
> for IR, the chances that your camera does not already have an IR
> blocking filter is extremely remote. Sunlight washout is likely due to
> scatter in the lens optics. A neutral-density filter in front may
> help, but will hurt your low-light response.
>
> But yes, you can scavenge IR filters from many cameras, although
> lately I've noticed they are often integrated into the window of the
> sensor chip.  What size is your sensor (the CMOS/CCD chip)?
>
> Josh, I've had good luck retrofitting Axis network cameras with
> visible-block (IR pass) filters. Some models have  a "night vision"
> setting which physically swaps out the IR blocking filter.
>
> On Wed, Jun 10, 2009 at 12:07 PM, David Yao<kudegra+nb at gmail.com<kudegra%2Bnb at gmail.com>>
> wrote:
> > Hi,
> > I'm looking to obtain a small disc of Infrared-blocking material to put
> in a
> > little video camera. I've heard that my camera's lack of such a filter
> could
> > be the cause of the picture looking washed-out in sun light.
> >
> > Supposedly I can salvage one out of a broken photographic camera if
> someone
> > has?
> >
> > -
> > DY
> >
>
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