Where can I get the dark slide material used in large format film holders.
I want to try and make some slides that cover half of the frame only.

Idea is for 14 x 17, one would be just cut in half, the other would have an inside rectangle cut out near the pull end....I could then use as needed as 8.5" x 14" a nice 1.64 ratio...and allowing me option of 2 shots per film.

Thanks all
Dave in Vegas