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If your footing is adequate for your pier and your pier diameter is adequate then it’s probably not required unless your imaging at ridiculous focal lengths , +3000mm
My rig in Sydney ( EQ6-R + 6” Newt , soon to be 8” Newt ) is sitting on pavers ( compressed river sand ) near my pool and I’ve done jump tests near the rig whilst guiding and no issues at all with Star shape ( focal length 900mm , soon to be 1050mm )
My NexDome Obs down South has an EQ8-R mount using the monster pier tripod with a 10” f5 Newt ( focal length 1280mm ) , sitting on 3 concrete piers , 300mm dia and 1200mm high ( 750mm in the ground and 450mm above ground. Piers are into a 500 x 500 x 300mm footing ( with 12mm steel reo rods and mesh ) Location site on clay.
Again I performed a knock test with a rubber mallet on the pier base footing whilst imaging , no issue with PHD2 guiding.
I’m sure that really high piers ( 1.5 to 2m + ) or narrow piers 100 to 200mm dia would be more susceptible to vibrations
My 2 cents …..
Martin
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