Nice pix, and interesting that the fisheye doesn’t seem to distort the cave — but then
we don’t have levels to djust to, and we don’t quite know what it looks like.
Robert, indeed, the fisheye lens works very well in caves because there are no straight lines to give the game away. Also, if the horizon is put through the centre of the frame it becomes very hard to detect that a fisheye has been used at all.
Here’s another recent image.
This is quite an unusual image in the project because it was taken with a telephoto and it is single exposure rather than HDR.