Originally posted by Kryscendo I know that the filter is there to eliminate IR light to the sensor. I just thinking what sort of market there is for it as there is very little actual first party support. It sure would pique people's interests if a camera company just came out and said "Yeah, you know our highly acclaimed entry level camera? Well, we remixed it and have a limited edition IR version for preorder." I think it would raise plenty of eye brows, particularly if they went into it more than just scratched the surface, which is what removing that filter does- scratch the surface on a type of photography.
Sigma has a removable IR cut filter for their cameras.
It's a very niche feature. The people who want to use it full time will mod their camera (and it is very rarely their primary camera).
Those of us who only do it part of the time, can use an IR filter. Different cameras have different strength IR cut filters. The K100DS has a relatively weak filter compared to the K10D and K20D among others.
Fuji offered a version of their S series cameras with no IR or UV filter on the sensor that was targeted to forensic work, and it was a very low volume item.
Once you start marketing an IR camera, you need to start testing and designing lenses for IR that don't have defects in that range. When you start doing that, you start cannibalizing your primary lens lines which actually make money for the company.