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Hi Mike, I'm not a huge fan of switchmode supplies in sensitive applications.
1. I would try running the robofocuser with a 12V battery supply to see if the cabling is not giving EMF troubles.
2. Try a standard iron core transformer (regulated) 12v power supply and check for camera banding.
3. Try wrapping the switchmode supply cable in a strip of foil and earth it to ground. (may stop RF radiation).
4 Fit a 10pf to 47pf capacitor across the 12V switchmode + and - cable.
See what happens
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