I assumed when I bought this DS-10 that the optical components were original to the scope, but the mirrors were not marked with any manufacturer’s name. Both the primary and secondary mirrors had aluminized coatings that were in very good condition. I didn’t have the equipment necessary to test the flat secondary mirror, but I did test the primary mirror. The Ronchi test revealed a good edge with a fairly smooth, parabolic surface. The foucault test also revealed a good edge and a smooth surface. However, after using my Faucault tester to take precise readings along with Figure XP software to calculate the results, I was able to determine a P-V wavefront error of between 1/2 & 1/3 wave for this mirror. Results? “Not so good”
I’m still not sure if this was the original primary that Meade supplied with this DS-10, but these measurements were not up to Meade’s advertised specs. Most likely, the original primary mirror had been switched out. I went ahead and built the first prototype around this mirror anyways.