I bought my first roll of film the other day. I'm sick of only having experience from one end of the photography spectrum, so I've expanded my horizons by purchasing a 36 roll of Kodak 400 Tmax B&W for my K1000(Which I originally only bought because of the lens attached to it). It's fun so far. It's very strange to have so little feedback as you shoot; just a little lightmeter in the viewfinder. With this machine, I doubt I could accurately predict what a flash will do to my exposure, but I want to try one anyway if I can. All I have is the Pentax AF540. Apparently, modern flashguns send less voltage through the body than old flashguns. So my K1000 is probably safe, but is there anything that could damage my flashgun if I use it on there?