dirkzelf said:
If anyone has any idea on this matter, join in please!
Ir sensitivity is flexible term, but in this context it has nothing to do with FLIR system so you must not mix these two systems.
Next you must remember that when using ir light you cant see colours, so it is very difficult to use it as evidence to catch somebody. Then you need some kind or ir light source witch consume as much power as any visible spotlight.
Basicly, it might be a fun subject to play with, but have no real life usage.
I have removed ir blocker from my canon powershot A590 camera, but after some intresting test images camera is mostly forgotten.
But now i checked with my GS5000 test camera because at the moment it has a lens without ir blocker, and it turns out that these GS cameras can see ir light very fine, colours are lost but in exchange you could hide camera totally behind black ir filter material. Cheapest everyday ir pass filter is developed camera negative film, you can usually find short clip of it if you have negatives at your home, some say that computer floppy disk material works, but it doesn't.
This GS5000 is ugly because i removed those red plates for not to attract thieves, but camera really can see through that black negative film clip.