I'm looking for some advice on taking pictures of my coil while its arcing. >From all the great photos I've seen on the Ring most of you must know what you're doing & I've already wasted 2 rolls of film with meager (at best) results. I have an old Nikon - great camera w/ no electronics & good lenses. Any help on Fstop, exposure time, film speed etc. would be greatly appreciated. Thanks, Jim