After looking back at the start of this thread you said 'that a viewing filter might be good to hepl me compose' to me a viewing filter is a post composure tool. A viewing filter helps to tell me that some colors may look the same to B/W film. Not as how they work as shape texture and form. When I make a photograph I am drawn in to the space and shapes and the things that make a image work. Not wheather the red and green on the wall be the same tone of gray. A viewing frame will help to isolate the items that you want to put in to your photograph. I have worked for along time with the view camera and finally got one that has the image right side up and a magic button to turn off the color. It just comes from doing and seeing. I hope this helps.