Primary Mirror Testing

Here are the results for the primary mirror.

The shadow in the map plots is the reference sphere and its support arm.

The test set up has produced an astigmatic distortion which is always symmetrical with the vertical axis of the Zygo The mirror is 28mm thick so shouldn't be classed as thin. I was not able to experiment to determine the cause of this.

The calculated Strehl ratio is 0.962.

AstroKeith 2014