[OpenSPIM] focal part changing when I move beads

[胡衍]

Hello, everyone.

I used my openSPIM to take photo for beads, 
and found the focal part is always changing when I move the beads, as shown in the attachment.
The beads are in a cuvette.

Is there anyone knows the problem?
What can I do to solve this?

Best,
Yan
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