autofocus on PerkinElmer Spinning Disk

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Zulin Yu Zulin Yu
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autofocus on PerkinElmer Spinning Disk

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Dear All
  Based on PerkinElmer Spinning disk manual, there are 2 ways to set up
autofocus. 1, based on image-contrast, 2 use additional contraption to detect
the cover slip surface. I am wondering whether anybody tried to detect glass
surface without additional contraption. I can set up a configuration to detect the
reflected laser light, but I have no way to set up the focus position based on the
image intensity.
  I do appreciate any comment and suggestion,
  Zulin at Stowers Institute