Hope no one minds me butting in here. AFAIK there are more CMOS thermal imaging cameras now than CCD but CCD got there first. CMOS tend to be more used for short wave infra red than far infra red. The ones with glass lenses are no use for far infra red, it cannot pass through ordinary glass. Would be ideal for cctv stuff though. CCD and CMOS are in a two horse race but like phred suggests CCD tends to jump the hurdles first. It may not always be that way.