Working Backlight

One of the last bits of the slide scanner I needed to make was to make a backlight for the slide scanner. I was thinking about how to make something uniform to light up the slides.I was thinking about this as I slept and I came up with a design that incorporates the same math as the hollow sphere problem, but in two dimensions instead of three.I have a solid white top and bottom piece as well as a clear (ish) surround. Around that is a series of 25 LEDs that I'm controlling with an Arduino.Overall it looks like the lighting is pretty darn even! A tiny bit of dust or stuff isn't consequential since it'll be so far out of fucus it doesn't matter. What does matter is the overall evenness across the field.I think that it looks pretty good.I even took a quick test shot with the Canon 5D and after processing it looks really rather nice!  :-DIgnore the crookedness, that's just me handholding the camera. The color, even after all those years is still pretty much spot on!