I wondered if there might be useful diffraction effects if I illuminated the probe with a laser that might make it easier to see when the probe was near the surface. The result was ... scary. Fortunately it didn't fry the optics.
Note how it lights up all the little bitty dust grains on the slide.
Oh, I've added an LED under the stage, so this is the view I get on my monitor when flying the thing. Having a functional "Home" on the controller is making a noticeable difference in repeatability.
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