Thanks for all the comments. I am far from being an expert on infrared photography though I amdefintely hooked on taking the pics. As I undestand it, visible light (to humans) has wavelengths below 700 nm (nanometers). Above that is infrared light. A true or full infrared filter blocks out all visible light. Apparently that doesn't result in a very "pleasing" image. Allowing a very small amount ofvisible light through (thusthe term near ir
) as the hoya r72 filter does, results in a much more pleasing effect.