Oooph I had not thought of that marking thing. My own dog will not heel with me across ground that another dog may even have THOUGHT of peeing on so I can imagine dogs either not wanting to go near pee'd down backdrops, or wanting to mark over the top of them.

I have 2 lights on cheap poles that I use to take slides of my art with, I will practice with those and get into this slowly. I always like to do a ton of homework first...is there a brand of wireless flash trigger on eBay I should be looking for?