No matter how many posts I browse through online I just can't seem to find the one that suits me. I bought some Efke IR 820 finding it's one of the only real infrared films still available (Both Rollei and Ilford seem to be more of a BW film with extended red sensitivity). Being a cheapskate I got myself some unexposed developed slide film to use as a sensor, I also have a Hoya 25A, but won't be using it this time. So now to get the real IR shots, but how? The problem seems to be getting the exposure right when using stronger IR filters, I'm hoping my solution with using a Sekonic Flashmate L-308 with a bit of the slide film over the sensor as a filter might get the exposure right, but testing it I'm not so sure. It seems to react with rather short exposure times near the hot sources, like close to the lamps or in the warmer rooms, but won't give me any answer when trying it in the middle of the room. It just doesn't seem to give any result at all for the overall exposure of a larger image. Is there any other way of getting exposure correct, like setting it to an especially low ISO, or maybe I should use the exposure I get when putting the meter in front of the warmer sources in the room? Just how do I guess the exposure for this film, I'll probably need to bracket, but I still need to find the estimated exposure time and aperture for the film so I have something to work around.