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I have a single slab. I did that because I have no way of digging down to bed rock to give a solid foundation for a pier. And I've heard of plenty of wobbly hyper sensitive isolated piers in concrete blocks in my type of soil.
The slab isn't ideal though and whilst I don't get the same sort of issue that Brendan talks of (I thought I might, but got lucky) I do notice on occasion that the rather crude dome rotation of the Sirius can put a small vibration into the scope. I noticed it much more with the LX200 forks, my EQ8 is so much more robust.
So my ideal set up would to still use a wide slab to give it stability on the surface, but mount the Observatory on a floating Deck. Thankfully - I can still do that in retrospect if I can ever be bothered. I can't...
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