Quote:
Originally Posted by Merlin66
Why is it so difficult to find an IR blocking filter (say>700nm) with NO UV restriction (ie <380nm)??? 
They all seem to be variations on the UV-IR blockers.
I'm looking for a IR blocker which still allows access to CaK/H at 393nm |
Hi Ken,
If you are using a colour camera with sufficient UV response for your purposes in the Blue channel when naked without any filter, then you could try using the camera that way (naked) and simply discard the Red Channel containing the IR, depending of course on how much IR bleed through there is in the other Green & Blue channels. Sometimes there is some IR pickup in the green and blue channels above 800nm or so, from what I recall of manufacturer spectral response curves and therefore may effect the suitability of employing this "trick".
Of course if it's a mono camera application, then keep looking
EDIT: there may be another "trick" possible in this case
Best
JA