Quote Originally Posted by freygr
Yes the all digital cameras have an IR filter. The IR filter DOES NOT affect the sharpness or visible color seen by the sensor. The reason it is there is because the image sensor will see the IR light overwhelming the red channel.
Mmmm not strictly true. you can't really dismiss lots of the visible spectrum and say it has nothing to do with sharpness... Light is not seperate colour channels like Photoshop says. It is a band of frequency of which red is part. But essentially yes you are correct there is a filter for colours which softens the image the sensor perceives and a filter for infrared as CMOS and CCD is way to sensitive to IR (and UV)