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I'll leave it to the imaging guys to give a comprehensive answer regarding weights, but from what I understand the weights quoted in the specs on mounts are more what can be mounted and get reasonable performance, which in effect means OK for visual use. High end imaging is much more demanding of a mounts capacity. And from what I have seen of imagers, they do tend to keep piling more stuff on their rigs, so a good bit of leeway is a good idea.
Also bear in mind there is no independent standard for the weights quoted on mounts, it is entirely the manufacturers opinion, so often a good idea is to get in contact with people using those mounts and pick their brains.
Malcolm
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