Thanks Curt.
The GoPro shots were all taken with the camera mounted on a GoPro Handler Floating Hand Grip (
https://shop.gopro.com/EMEA/mounts/the- ... M-002.html). It does seem to be a good way of holding the camera steady. Also the GoPro 6 appears to have good image stabilisation. The GoPro was set at 2.7K and 50 frames per second. Although the edited video is HD 1080p, using the higher definition setting allows Ken Burns to be added without loss of image quality. Also I've read reviews where it appears that using the higher definition settings improves dynamic range and reduces noise. Perhaps I should try 4K next time.
The opening shots were taken with my Lumix GX7 mounted on a tripod.
Lighting is very important. Two of us have Scurion 1300 lumen helmet lamps, but for the longer shots I used 3, 3800 lumen Fenix FD65 focusable torches (
https://www.fenixlighting.com/product/f ... lashlight/). These are excellent for video with a very white light, no hotspots and of course very, very bright. Oh and the torches are waterproof too! We tested this out when one got accidentally dropped in the underground river. It survived a 10-minute dunking at a depth of 60cm while we frantically searched for it.
Keith