I have photographed 20 caves and cave photography is always fun and challenging. I do not use flash very often. All of the photographs within my cave galleries were taken without flash.
My cave photography requires the following: a tripod, camera, cable shutter release, patience and the willingness to learn. A latest edition to my equipment is a Canon A60 Digital Camera.
A tripod is very important when taking photos especially when not using a flash. When a tripod is not allowed then I can only take photos of brighter areas with a very steady hand. I often set my exposure to the desired f/stop then bump it to a wider f/stop so that I can get an exposure of at least 1/60. At this f/stop a steady hand will give a fair photograph. If you can't get your exposure of at least 1/60 then the photo will have too much shake to it. Sometimes handrails can be used to steady you enough to get a photograph below 1/60, but handrails are round so you have to have a steady hand.
Choose a camera that has a timer to trip the button or takes a cable shutter release. These are low light conditions and you want NO CAMERA SHAKE. Pushing the button to take the picture maybe just enough camera shake to mess up your photos. I use a Minolta X700 and usually use one of the following lenses: 50mm f/1.7, 28mm f/2.8, 135mm f/2.8.
All the caves, except one, are guided tours. Some tour guides move really fast. The tour guide we had in Sonora for example was a high school student and he got out of breath because he was going to fast. He caught up with the group that left 30 minutes ahead of us and we had to wait. The guide in Innerspace waited patiently for each room to be fully enjoyed. You never know what kind of tour guide your going to get. One must stay with the group as they turn lights off in the cave as they pass sections that have been viewed. This is important as algae will grow on the formations. So keep this in mind while preparing to photograph a cave.
IF you have any questions or comments feel free to email me.