Cave photography is a hostile environment for electronics and there are a lot of shots I wouldn't risk attempting with any of my other cameras.
The GoPro 4 Silver is pretty much ideal for this. The screen lets me use it pretty much like a regular camera.
Another reason the GoPro works well in this environment is the wide field of view; my compact is 28mm and I've often been wanting about 1/4 frame extra. I'm using a 15mm fisheye on the big camera which is just about perfect and surprisingly close to the GoPro results.
This first shot was hand-held using Continuous mode at 5fps with the sharpest frame being kept. I'm pretty sure night mode would have done better but I didn't have a tripod with me.
Conditions in this cave are OK and I could have used a traditional camera, but I didn't have one with me. I've printed this to A4 and it looks great! I'll retake it with the big camera at some point and the comparison is going to be interesting.
It's lit by a 30W Cree floodlight to my left and slightly above. The floodlight is a wonderful bit of kit!
This next shot is a reccy for an image I have planned. I want the caver framed by the arch of rock as they dive through the sump.
The lighting is going to be the challenge; this shot had the big floodlight on the far side of the sump, hence the back lighting which looks great! I have another shot with the big floodlight on this side of the sump and the rock looks far clearer, so that can be solved.
The other problem in this image is the caver, they needed to lead with their other arm and they are moving too fast for this close-in shot to be sharp; next time I will know how to instruct them better! Also, they should have waited a few mins to let the water clear from their outbound dive.
However - I now know the shot I'm after is achievable, but it may take a few more attempts to get right!
In summary - the GoPro is a real asset to my cave photography project, but I've got a bit a learning curve working out how to get the best out of it.
As they say - watch this space!