"Ken Moon" wrote: George, I'd have to try that (light flickering through a
hole), but I don't think that would "stop" the rotation like the timing
light or a strobe light. (clip)
^^^^^^^^^^^^^^^^
Ken, I am pretty sure your analysis is correct. A strobe is a bright, very
short burst of light, as opposed to a sweeping beam. I want to add: to
avoid skinned knuckles, you don't want perfect 1:1 synchronization. You can
play with strobe frequency to make the image rotate slowly, or you can set
the strobe to a frequency which is a multiple of the spindle speed, so the
threatening branches from all sides are seen at once. If you just "stop"
the image by exact synchronization, it will create a real sucker trap.