hi guys, I'm sort of new to IR photography. I wanna use my Canon A80 to capture some IR images. But when I tried the Hoya R72 filter in the shop, there's no diplay on my camera screen except for the very bright spot light. I wonder how you guys take IR pictures if it can only capture the bright spot light? besides, in the previous post (http://www.photo.net/bboard/q-and-a- fetch-msg?msg_id=007ELI), it says we can capture under skin vein with the digital camera and IR filters. sorta quite curious to it. How to do that?