Ronchi tester for telescope mirror
thingiverse
I designed a Ronchi tester to evaluate astigmatism in mirrors by holding a laser-printed grating. A removable insert accommodates an LED, or you can simply direct a flashlight into the rear compartment. On the bottom, I incorporated a 1/4-20 nut that can be glued in place for easy mounting on a tripod. The result is seamless integration and precise functionality.
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