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malc,
I should have said with the modified flip-mirror guider and Al's reticule once set up it doesn't change.
You can remove the spectroscope/ guider and replace without additional calibration.
It's only when you remove and replace the guide camera you may need to re-calibrate the "virtual slit" position.
The beam-splitter adds 30mm to the backfocus requirement i.e. goes up to 85mm.
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