A better Ronchi tester
Oct 06, 2021
2 minutes
by Jerry Oltion
use the Ronchi test to evaluate their mirrors during the parabolisation phase. With the Ronchi test, over- or underparabolisation, zonal deviations and turned edges are easy to detect and quantify. The test is simple: Shine a light at the mirror through a grid of evenly spaced lines and look at the reflected
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