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IR/UV related questions

Started May 11, 2021 | Discussions thread
ProfHankD
ProfHankD Veteran Member • Posts: 9,147
Re: IR/UV related questions

Damovich wrote:

Those colors are off less than I expected... until I looked-up the DSC-W15, which uses a Super HAD CCD.

Not all, but many CCD sensors have somewhat less sensitivity to NIR than newer CMOS sensors. Obviously, you're still getting some sensitivity, you just might find NIR-only exposures require a bit longer than for some newer sensors without NIR-blocking filters. The good news is, I don't see an NIR "hot spot" in the middle, so your lens is probably ok for NIR.

BTW, these are NOT good, but here is a quick attempt to isolate RGB vs. NIR. The correct way to do this involves a calibration procedure, so this is using some guessed parameters instead:

RGB

NIR

Lots of noise and JPEG artifacting in the NIR extraction... which probably wouldn't get a lot better even if it was calibrated.

In sum, yeah, you need to buy filters. 

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