...why not buy cheap Canon (maybe A series), remove the filter there, and just put CHDK on it? Hell, i can sell you my 10 years old PowerShot G1 (just needs a new battery) which is NIR-compatible out-of-the-box! Or a second-hand years old Sony camcorder? with night mode? It's just one small box more. The N900 is not _that_ an all-rounder. At least not without frankenstein-looking. The amount of time you spend on research & modding is with very high probability more (expressed in bucks) than it would cost you to use a second-hand dedicated device (with it's own battery, btw.).