[popo]

The three channel colour filter is supposed to represent human vision, so as such that is all it could ever hope to deal with. By removing the filter, we can increase sensitivity within the visible spectrum (assuming you use a different sharper filter to cut off IR/UV) but the balance will start to deviate from what the eye sees, even if mitigated by colour balance adjust.



Also it is not quite as simple that IR/UV are only stored in red or blue channels respectively. It can be quite clearly seen that the green channel is still weakly sensitive to IR, while the blue channel does cut out the nearest IR, it increase in sensitivity again at deeper IR. On the UV end, possibly there is some residual sensitivity in the red channel. Of course, none of this is a real issue with the original filters in place. This only becomes interesting if you're going beyond that. This was primarily for me own information as I recently got some really cheap IR filters off ebay and I wanted to see what they really do.



I should add I found a problem with my test method above. I forgot that for most lenses the IR focus point is not the same as for visible. I did focus in visible, so the IR spectrum presented will be blurred.