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Hey Peter,
Those angles, are they the rotator PA while being moved by the motor, and the dial gauge is fixed? And what is being used as the reference surface, the rotator body I presume?
So I see two possibilities:
-the moving tube of the rotator is rotating true (no eccentricity) and the end, or mounting surface, is cut crooked
-the moving tube is cut square but rotating with eccentricity
In either case the other end of a 'perfect' adapter attached to the moving tube will draw a circle around the optical axis.
I assume you measured the surface at a diameter of 100mm
The angle is 80 um / 100 mm = 0.8 mrad
and the orbit radius will be 0.8 mrad x 190 mm = 152 um
The side to side motion will add/cancel to the above with an amplitude of 80ish um.
Not too bad really. A 0.5 mrad tilt of the image plane gives 0.5 mrad x 35 mm = 17 um of defocus in each corner of your KAF16200 chip (plus in one corner and minus in the other). No big problem at f/7.
EB
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