How Accurate is the ST4?

The ST4 uses stepper motors to drive all axis, giving it increased accuracy which is advantageous over servos in lower voltage systems. Movement of the stepper motors is measured in microsteps (versus degrees). See the chart below for translation of stepper microsteps per degree.

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For precision and accuracy it is quite high.  The technical smallest movement on Pan is 0.000305 degrees and 0.000115 degrees on Tilt. For Dana Dolly the smallest movement is technically 0.00218 mm.