Here, I tried to "paint the walls" of the cave with our flashlights without my external flash. I put on my ultra-wide angle lens here -- you can see that I was not very successful with a lot of noise and too little light (I amped up the exposure in Photoshop), probably because I used too wide an angle for just 30 seconds. It is a pretty cool effect, though! FYI -- I packed somewhat "light" for this excursion -- only my two wide-angle lenses, but also my tripod and external flash so I had to do some lugging around. It was really fun crawling through the last little bit of the tunnel with all that gear!