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Hello Bill
The 8 inch f/4 will be smaller, so it won't be impacted as much by gusts of wind. Same thing for 10 inch f/4 - you'll need a really good mount.
I saw some good results from a 6inch newt with DSLR recently. That could be something for you to consider. If you're not guiding, you'll need a wide field of view (short focal length) and very short subs.
James
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