Event

Testing a mirror at an ATM session

This is a Ronchi-gram of a home made 6" f/5 mirror.  When parabolized the Ronchi-gram shows a curved pattern like this.  This mirror still has some residual zones as the curves contain a noticeable wiggle at about 70% of the radius.  After more figuring the mirrorwas declared finished at 1/18th wave!

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