Well- IR is a different hack, I did that with my Nikon Coolpix 950. I bought the glass Windows here:
AnchorOptics.com - Supplies affordable, quality commercial grade and experimental grade optics
The thickness needs to be close to the original IR absorbing glass window for the Focus to be maintained.
No need to change out firmware.
Paul, please let us know how you get on...as this idea is intriguing. Of course it has me scanning eBay for these sub-$50 candidates.I'd never heard of this before ... excellent, I'll have a crack at my old IXUS 750 (SD550) ...
hehe maybe I should have made this my SiJ camera!
write times with raw DNG switched on are quicker than the DP2s by the way, but then it's half the pixels innit?