Mirror Polisher's Log Sheet      mir-log.gif

You can use this sheet to plot the difference between a reference sphere and the actual curve of your mirror.
Since we will be testing at 250 feet we will be using a reference parabola and plotting the difference between a
reference parabola and the actual curve of the mirror.

OK, I can here the grumbling now.  "The test star needs to be more than 3 million light years away before you can call it a reference parabola".
All I can say is don't worry about it. If you can make a 1/10 wave elliptical mirror then worry about it if you wish.

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