OpenTrackRacer wrote:Before I started bringing a DSLR I was using a point and shoot with full manual controls. I'd hand hold it (or set it on something for side lighting) and simply open the shutter for 2 seconds or so. In that time I would manually trigger an old flash I was holding with my other hand. It's not the cleanest or quickest method but it did produce good results.
I used to do the same thing, but your subjects either need to be perfectly still or they have to turn their lights off (or both). Otherwise you get streaky light photos.
Hmmm, DSLRs. I have one, but it doesn't go caving. Too heavy, too bulky, too expensive. There are numerous 'mid-size' digital camera models with full manual settings and hot shoe mounts which can produce superb quality images. They're smaller and cheaper than DSLRs, too. Even some compact cameras without a hot shoe have manual settings which also disable the digital pre-flash. Particularly Canons. A single flash makes triggering a remote (optical) slave much simpler.
Mudduck wrote:NZcaver wrote:Does your camera fire a single flash with each shot, or is there a quick pre-flash or two before the 'main' flash?
It fires a quick two best we can tell. the camera is a Kodak EasyShare C613. I realize this is sub-standard equipment but as I said cave photography is something really new to me(with respect to "nice" photos) and I like to dip a toe to see what direction to go in before taking a big step. The thing that boogles my mind is why it worked great at first. I checked multiple times to be sure the "automatic" settings were'nt changed between practice shots.
This is just a shot in the dark (bad pun)
but it *might* be this. Assuming your camera fires two quick flashes for each shot, the first flash helps set exposure/white balance, and the second flash illuminates the scene as the camera captures the image. With fresh batteries, your flashgun probably mimicked those two flashes by recycling almost instantly between flashes. But as the battery capacity declined slightly, your flashgun took longer to recycle after each flash. This can result in the flashgun triggering with the pre-flash, but not with the main flash immediately after it. Resulting in... dark photos.