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Thanks all. Jase the dark neb in the bottom right hand corner is the 'thingo' in Musca. I have superimposed a map from StarAtlasPro on the image with Registar.
Scott I use a stepper motor to focus lenses. This stepper has a 1350:1 gearbox with almost no backlash so it holds focus without the motor being energised. I can also swap filters and the focus is not disturbed. I have not yet done it for the 85mm lens but obtaining focus if you swap filters it is just a matter of changing focus by the correct number of steps. Different manufacturers have different optical path lengths.
Bert
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