I documented this series on the theory my various screwups might be of mild interest to someone. It's easier to write about problems anyway, cuz then you have a starting point (the problem), a middle (why it happened) and an end (how to prevent it). Hearing about something that went off perfectly is kinda boring, anyway.

Something is going on here!

Besides, I wanted to figure out how I screwed up, and figured this would be as good a way as any to analyze my various failures.

wonky dichro focal, showing some design development.

2nd? in my series of ugly bullseye dichro focals.

start of a very unsuccessful dichro focal series.

Unless otherwise noted, text, image and objects depicted therein copyright 1996--present sylvus tarn.

Sylvus Tarn