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David-Stokes: M108 -- sharpest center focus
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David-Stokes: M108 -- sharpest center focus + 1/24th turn CCW
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David-Stokes: Messier 13 -- The Great Hercules Cluster
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David-Stokes: Messier 37 -- sharp center focus
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David-Stokes: Messier 37 -- sharp focus + one-24th CCW turn