Hello, I am new to the forum and fairly new to photography (3 years). My work mainly centers around the artistic nude as well as vintage and journalistic style. I use a Pentax K1000 and a Mamiya 645m. Can someone please give me a suggestion for good infrared filters for the Mamiya. Also, I am a bit confused on the issue of "spectrum". Any help would be most greatly appreciated. I am so happy to have found this site and will soom become a subscriber.