MDM Trouble Report for 2017 Apr 08

Telescope: 2.4m
Observer(s): Edmund Hodges-Kluck (Michigan)
Instrument: OSMOS R4K

Problem(s) Encountered:
This report spans my whole run. I noticed today that the rotator
angle is systematically offset by about -1.5 degrees (i.e. I had
to add +1.2-2.3 degrees to get it about right). Previously I had
thought it was a problem with the angles in my object list, but
comparison with ds9 showed a consistent offset. Although the 
seeing is good, the actual offset is hard to measure without a 
dedicated effort; I am not sure if it is a constant offset. I went back 
and verified that this issue was in the first image I took, so 
it preceded my run. 

The website instructions say not to play with the rotator encoder
without consulting staff, so I merely accounted for it in the
remainder of my observations.

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Submitted on 2017 Apr 9 [3:59:49]