The capacity relates to the scope and it's immediate accesories.
If skywatcher says you can load 18 kilos on it and you want to put less.... Go for it.
You can overload all mounts to some degree, being a visual only setup, you don't have the problems that have been focused on generally in your thread.
All scopes when viewing at high powers will be subject to atmospheric turbulence etc. I would suggest if it's windy just find a sheltered spot to minimize any wind.
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