Hi, I've just joined the group and saw this post.
Many years ago before the advent of digital photography I used an old bellows 120 roll film camera. The camera was tripod mounted, shutter locked open and I painted the scene with flash to get an image! Today with the digital camera, techniques may be different but you can with software stitch or merge images to create the format you require.
Taking a good cameras below ground is not for the faint hearted but a DSLR while a very nice bit of kit has no advantage underground. Not easy to see everything through the view finder in near complete darkness, whereas an LCD screen presents a totally different view. The Nikon 8400 is a fine camera but even on E-Bay today it tends to hold its price. It is or was the preferred choice of camera for KAP (Kite Aerial Photography) but like everything it has been superseded. Currently I'm using a Canon A640, at 10mp and able to accept remote USB commands fits the bill nicely for my aerial work. Like underground the advantage of wide angle in the air helps with being able to photograph at reduced altitude as opposed to confined space. But think on, underground even if you hand hold photos, over lap and stitch you should be able to create some good shots. This will be the approach I'm going to try when given the opportunity. You can pick up recon A640's and the like from the Canon store on E-Bay for about 120-150 quid. Nearly all these compacts will accept conversion lenses with an adaptor.
Meanwhile to see some of my amateur work check my web site out. Not much there at present and the 2 big panos I've enlarged too much really but I was just pushing it. Imagine doing these underground even in tight spaces.
http://www.kap.toadstone.com I'm looking forward to trying out underground photography again after all this time (I'm talking late 60's early 70's when I was last underground seriously) with a digital camera.
I've put 3 'straight' aerial views up on the Magpie Mine pages.
Peter.