Optic
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Show the status of an optic.
Depending on the kind of the device, an optic will be displayed as:
- A fixed magnification which can be tuned
- A selected magnification from a fixed list
- A selected magnification from a range of values
With a fixed optic, specify the option allowtuning to allow the user to
change the magnification. It does not move the device, but change the
value exposed by the device.
An optional number of digits can be used to setup the precision.