For DSLR control, guide operation, etc you can get away with a fairly low end laptop, something like an HPstream for example. However if your going to be processing on the same platform then you need a higher end machine. I use a low end HPStream in my observatory, and take It's to the dark site, It's very long battery life is a big plus. Image processing is done on my big laptop at home with a good photo editing screen. So choice is dependent on what you require It's to do, power availability, and budget.
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