Positioning accuracy of Cyanogen filter wheels

Hello!

I'm looking for possible filter wheels for photometry. My previous experience has shown that all filter wheels that use slip rings for movement and Hall sensor for position detection are not very reliable in cool (I mean -20 C in winter) climate nor very accurate. Very old SBIG filter wheel had +-2 mm centering accuracy and rather old Optec one had +-0.2 mm accuracy. That is not very high compared to e.g. former Apogee filter wheels that use physical referencing and that position always with sub-pixel accuracy.

So my question is - do all Cyanogen filter wheels have physical stops? If yes, is there any play around those stops? Even small play can be important if sensor has small pixels like as it is rather common nowadays.

Best wishes,
Tõnis