I dont think it really matters if you achieve the effect that you want Well....How do you know what you want? If you havent shot IR images before then your not going to know how the IR light reacts with materials. Alot of manmade materials absorb IR. All vegetation reflects IR, except for bark(it absorbs). Water turns into a mirror, glass turns dark. Certain clothing materials pass IR, the large leaf in the pic i posted above was close to death...notice how the IR passes through it, but then reflects off the live leaf below it.(All three leaves are laying in water, which i know will give me a nice black background at that close range.) Focal point of IR light is very different, it cuts through haze yet absorbed by smoke. Color IR is also possible...That RM-72 is the lightest IR filter. Meaning some visible light is also going to get in there and add false colors with the IR. I wanted the RM-72 one originally but bought a B+W 093..100$ :(....cuts 100% of visible light. My mistake...so i made 2 RM-72s with some polarized sunglass lenses, Gives me the false colors i want without the need for postwork. As for DSLRs, he explains that about those on that link i posted...In digital cameras, a tiny filter is infront of the sensor that absorbs IR so you wont have contamination in your photos. But they differ in strength depending on the camera. My Nikon 4300 loves IR. On DSLRs, it depends on the lenses you buy for it. Sorry for all the posts. I just saw Kim was interested in IR and was planning to buy a filter and i just wanted to help her on her journey into a different part of the spectrum. Mike