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There's also an article by Stan Moore that suggests .5 to 1.
I've heard 1 before from Roland Christen of Astrophysics.
The best way to decide is to move away from theory as not everyone agrees and look at various astro images and see the size of the stars etc
and level of detail of people using similar scopes to what you plan to use.
What camera did they use?
From what I have seen .5 to 1 seems correct. 1.5 also seems fine.
I am not sure its that sensitive and perhaps has been overplayed as an issue in imaging.
I agree with Paul its better to be slightly undersampled than oversampled as all it costs you is a slight loss of sensitivity and you get round stars.
But then there are tons of great images with 9 micron cameras. I have mainly used 9 micron cameras and they performed the best overall but I think that was mainly sensor size as well.
Greg.
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