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The general consensus from the totally committed Astroholic is something like a 1 cubic meter reinforced solid cube under ground with an integral pier cast with rebo included to the mounting plate or a bolt down pad at the concrete cubes surface. Or similar, you get the idea.
I think the isolation issue is primary, keep pressure away from the scope support but the cube is a bit overkill. It seems to have been derived mainly in the USA where frost heaval of the ground subsurface is an issue.
A 600mm hole of 800mm depth would be pretty substantial IMHO dependent on the all up weight of whatever you end mounting at the top and the ground soil properties of the location. More information needed I guess.
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