Quote Originally Posted by manfrominternet View Post
Minimizing all stray light is essential, absolutely. I've made masks for my 4x5 and 6x12/6x17 (med. format) negatives and transparencies. When I scan my negs, I make sure to turn off all the lights in my room and scan only at night.
One easy solution to working with room lights on is to spray paint with matte black the inside of a card board box and place it open side down over the light source and the masked-off negative you will be scanning. To give access to your camera and lens, just cut a small circle in the top of the box through which you can place your lens.