Re: Will IR Illuminator work with any CCD Camera?

["Brian" <b.blandford@xxxxxxxxxx>]

Charles Sullivan wrote:
...
>
> As I understand it, the reason for including an IR filter is that the
> focal planes for IR and visible light are different enough that there's
> a noticeable blur in the image if both sources are present, as in
> sunlight.

There is a more serious problem, and that is the fact that silicon is
transmissive in the near infrared (it is opaque in the visible). That
means that the NIR radiation falling on one pixel will travel through
the detector material and light up adjacent pixels, degrading the MTF.
There is nothing a lens can do to fix that, you just have to filter it
out.

Brian
Ancient and Modern Optics