First light test results. The edges seem light tight, but there is obvious leakage coming from the dark slide entrance slot (1), and a bit at the opposite end on the corners. The light hit the dark slide (4), which is hi-gloss, and left dark streak from a reflection. I think? Anyway, there’s no light trap where the dark slide enters the holder, so I need to work on that. We’ll see how the next test goes.