Hi all, Need some advice here. I'm looking for the smallest powerful accessory flash I can find. I hold the flash in my left hand and use open flash technique (basically opening the shutter for a long exposure and manually firing off the flash to make the exposure) so all I need is something with a test button that I can push to fire it. I don't use the flash mounted to the camera and I don't worry about flash sync speeds because I use the above stated technique. The key here is SMALL but still powerful. Any suggestions?