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Agree with you on that one Mickoid.
Was out testing my widefield setup after experiencing what TIM has described and dicovered that the camera is very sensitive to movement. Even walking around the tripod can upset it whilst shooting your exposures. The counterweight can slip during tracking as the extension rod on my mount has some movement in it. So I think rid the counterweight completely. The mount should handle the weight of the camera on its own without too much problem.
Also add in a 15sec delay after activating the shutter to avoid any residual shake after the mirror flip, and avoid any loose cables attached to the camera from fouling during exposure such as an intervelometer. The slightest touch from a small breeze can cause issues here too.
It all goes in the melting pot...
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