edgehill:
Work-bench test shot, I was able to raise that last vignetting out in the final version. I went through 4 or 5 completely different assemblies, each not quite right.
edgehill:
Cutting the lens board with an exacto. Bamboo frames are done with thin plywood hold-downs, all screws, no glue.
edgehill:
These three show how tight the fit is on the small end, requiring a cardboard test piece, how that ended up being asymmetrical, and how the last fold needs to be trimmed off.
edgehill:
These three show how tight the fit is on the small end, requiring a cardboard test piece, how that ended up being asymmetrical, and how the last fold needs to be trimmed off.
edgehill:
These three show how tight the fit is on the small end, requiring a cardboard test piece, how that ended up being asymmetrical, and how the last fold needs to be trimmed off.
edgehill:
Attempt at eliminating the hot spot by shooting off-axis with a tilt lens, then stretching back into scale.
edgehill:
Best effort using flexible 'placemat' plastic material as the focus screen. Contrast adjustments emphasize vignetting.
