we are a small group of urban explorers (climbing around in old underground tunnels), and now we want to start take photos down there. we are using a Canon EOS 10D with a tripod, we are shooting without flash, during a long exposure time and are "painting" the area we are going to take photos of with flashlights. we can get some decent shots but it's kinda anoying to be draging around my heavy and not so very userfriendly tripod everywhere. but I heard that you can take good photos in the dark with IR-filters without using a tripod and long exposure time. do you got any advice or hints about what is the best way to capture nice shots?