OK, so here is where I think we are with the s/d/f cassette:
I presently have a pretty circular view through the cassette in camera mode, using the 0.1 ND in the lens wheel with the bias turned down so as to avoid swamping the array.
Slit = open at 1.5 degrees (4.9691V) rather than zero
Decker = open at -1.5 degrees (4.9476V) rather than zero.
Filter = BP5500 at 42 degrees (4.0367V) rather than 30.
Based on this, I am inclined to enter these values for Volt_0 for the slit and decker, and to enter 4.0367 +.667 = 4.7037V as Volt_0 for the filter wheel.
Would that make everything good? Inquiring minds want to know.....
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