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Posted by Walter Hamler on August 16, 2001 11:35:19 UTC

If f/6 is what you want to end up with I would start out center over center, 1/3 stroke or less, and alternate between tool on top and mirror on top. Once total contact is reached at 220, check your radius of curvature to determine what changes may be needed. I usually check by reflecting the suns image and measuring the focal length directly.

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