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Darrell,
Not specifically for an observatory but, in my 30yr career as a professional mariner the introduction of computer screens on the bridge of a ship introduced a huge problem in terms of maintaining night vision.
The solution was red perspex, held in place by some self adhesive velcro... & turn down the brightness...
If your eyes are dark adapted you will have no issue using a laptop this way & you will maintain your night vision perfectly...
Cheers
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