Today I started using the old Vivitar 3500 flash off my Mom's old slr camera on my D80. I got some pics with a half dark picture/half light. At first I thought the darn thing broke my camera with a high voltage or something. But then I adjusted my shutter speed and realized it needed to be slower to capture the whole picture in light. Can you help me understand this in general.....maybe give me a couple of crash course paragraphs on external flashes and good pictures?? I've read on the net that this is called flash-sync speed??? the fastest speed at which the camera can get the picture and have it all lit from the flash?! Is that right? And then I read the D80 has a max speed of 1/200 sec. Does this mean when I use my external flash I can never use a shutter speed of anything higher than 1/200? Thanks for your help!