«

DaveC wrote:
> I want to photograph and video in infrared mode.
>
> I understand that some point-and-shoot cameras provide this style of
> photography/videography. Alternately, some people have "hacked" a camera by
> removing the IR filter from in front of the imaging element. There are
> instructions on-line to DIY this, or to send in your P&S to have it done.
>
> Basically, the IR filter is removed and replaced with another (not a
> procedure for the faint at heart). The replacement filter is $$$.
>
> My question is this: is this replacement filter that passes rather than
> blocks IR available as a gelatin or other commonly available filter that I
> can source elsewhere other than from these camera-mod services?
>
> Or can I just strip off the existing filter and not replace it with anything?
> I'm looking for quantitative data (the existence of IR) not qualitative data
> (a pretty picture). What function does the replacement filter provide (other
> than passing IR data)?
>
> To clarify, I want to "see" IR images real-time in the viewfinder, not
> post-process the image data to reveal the IR.
>
> If there's another forum you suggest I should ask this question in, please
> let me know.
>
> Thanks,

You will not SEE the IR regardless of whether the filter allows a live
preview.

A filter only allows or blocks a given wavelength- it does not CONVERT
it from one wavelength to another.

In effect, the digital camera does a conversion, but provides three
channels of color info. The read channel does not maintain spectral
information. All reds are the same. What the result is is a "false
color" picture. You are not viewing real infrared radiation when you
view a print or a viewfinder image taken with an IR-enabled camera.