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Testing the Rocky Mirror #2

The completed mirror tester is working out wonderfully. It takes a little time to set it up just right, at twice the Focal Length (not pictured), but this is an invaluable tool for checking your telescope mirror for parabolization while fine grinding, polishing and figuring. You can find the original design at Stellafane Observatory.

Setting up the tester
Setting up the tester

The Rocky telescope was named after a very special puppy that has since passed on.

Completed Tester
Completed Tester