Maybe I just got lucky, but when I use an external flash for some in-cave photography, it is a Vivitar 285 which happens to have a little button on the stem that allows me to manually fire the flash. I typically put my camera in Fireworks mode, have everyone turn their lights out, press the camera button and then have someone fire the flash while the shutter is open. While this works fairly well, the V285 is kinda big. I was wondering if I could find another flash that could be manually fired like that and that wasn't so big. When I tried searching on-line, I found that I couldn't tell if a particular unit had that little red button that allows me to manually fire it. Is it just a test button, or does it have a name? Also, if anyone has any suggestions about a flash this would be consistent with what I'm doing, I would appreciate it. Thanks.