The window on the back has absolutely no effect on IR. Or any other film, obviously. I don't know about the situation regarding an IR sensor on the F100 but a simple web search would turn up the information. There are also a couple of IR groups on Yahoo!groups that would help you out. David Thompson wrote: > Personally, I wouldn't.. as you said, the little window. If you have a > camera minus the window, then yes. Also - can't use auto-focus or exposure > - go pure manual. > > If you don't mind experimenting, maybe some black elect tape over the > window? But still, go manual. > > Dave > > At 10:27 AM 12/25/2002 -0500, you wrote: > >Stupid question time - can one use hi speed infrared BW in F100? I think > >the answer is no because of the window on the back door and possibly there > >maybe an infrared film counter - BUT does someone on the list know the > >correct answer? > > > >TIA Ernie Nitka, new list member > >http://www.ernienitka.com > > > > "I saw a subliminal advertising executive. But only for a second."- Steven > Wright -- ============================================================ Don Roberts * Bittersweet Productions * Iowa City, IA * * And the Devil whispered behind the leaves, "It's pretty, but is it Art?". -- Rudyard Kipling ============================================================