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Posted by Robert May on October 17, 2001 18:31:57 UTC

Assuming that you now have a polish on all of your mirror, you do the test dry.
I live in a hard water area so I'm familiar with the problems. I take and dry the mirror with a paper towel and test from there. Occasionally, I will do a single pass of a damp mirror with the backside of my forearm but that is kind of risky if you've dirty in that area. If you are sure that your arms are clean it's not risky to dry this way. Don't forget to test at the ROC and that the shadow goes the same way as the KE when you're inside and vice versa when you're outside of the ROC.
Don't bother to test until you have the mirror fully polished out and don't use long strokes for polishing unless you like to spend a lot of time getting to the edge as the mirror is still getting a shorter radius even though you are polishing - whichever is on top is always going concave!

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