Cameras really block IR?

[vEr5e]

i read from one of the threads on how to get the IR and what i did is i took a remote control and look into the LCD screen of my camera. my camera do see the IR light. but it seems that almost all camera, my phone camera and web cam, they all take in IR.

i read from some places that devices like web cam, they sometimes block away IR with some filter. but why do cameras block IR?

and it seems to me that most camera devices, camera, handphone and web cam, they all allow IR to go in.

[LittleWolf]

Originally Posted by vEr5e but why do cameras block IR? and it seems to me that most camera devices, camera, handphone and web cam, they all allow IR to go in.

To obtain reasonable colour rendition, the spectral sensitivity of the camera sensor has to match as closely as possible the spectral sensitivity of the human eye (or, more accurately, a linear combination of the sensitivities of the 3 types of colour receptors). This is something that cannot be fixed afterwards with colour profiles or image processing. Silicon chips are inherently sensitive to near infrared. The human eye is not. If one is interested in acceptable colour reproduction, there is no choice but to block the infrared.

Cheap camera "gadgets" skimp on the filter because they're not intended for serious photographic use. Seriously, if you look at the image quality of webcams or most handphone cams, there would be several other more pressing issues that needed fixing first.

High-priced cameras are also not immune to this. Leica made the flawed design decision not to incorporate sufficient IR filtering (and an anti-aliasing filter, which is also a major boo-boo) into their M8, which means that users of this camera have to fight with very strange colour reproduction unless they fix the design flaw by putting an IR blocking filter in front of the lens.