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This is a pic of my 12.5" newt, on my home built EQ. the mount alone weighs in close to 150kg. And even this mount finds it hard to keep her steady enough to do astrophotography. It's ok for visual use.
I must admit, the OTA alone weighs 40 kg. More heavier than a 12" GSO OTA I would imagine.
As 1ponders suggests, it's the lever arm action that kills it. It it we're in an observatory rather than outside it would work...the slightest breeze is enough to bring an imaging session to a complete stand still.
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