I needed to make:
- Two different 8" x 10" frames out of black cardboard, with inserts cut to specific dimensions
- A transparent glass or thick plastic sheet 8" x 10" divided into four equal quadrants by two permanent black lines, like a crosshairs
Here's the final result:
I put masking tape along the edge of the glass for safety reasons.
Here's what it looked like clipped to one of the frames for close up work:
And here's what it looks like viewing something at a distance:
Using the viewfinder is supposed to help train your eyes to see contours and lines more carefully, which also helps with depth perception. I'll soon see how well it works for me!