Thanks Al! This seems like such a good idea that I rushed out and bought a container this afternoon. I've been futzing around with old pillow cases over the laptop screen during timed exposures - not a great arrangement. I'm thinking I'll need to drill some access holes in the lefthand bottom side though, for USB cables for camera and autoguider control.
As a side issue, can anyone suggest a source of suitable red filter material for the laptop screen itself?
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