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Hi Cliff,
I have found my MiniTower Pro to be quite sensitive to imbalance in elevation. If not properly balanced with a scope at 1500mm focal length, I was finding motion in elevation haphazard when trying to centre objects and some annoying drift in elevation. These problems were not so apparent in my other scope with a shorter 580mm focal length.
The solution was to ensure the scope was very close to properly balanced. Note, one needs to have the scope balanced when it is in the horizontal position and in the vertical position. This ensures the scope is properly balanced in any elevation position. It was the lack of good balance in the vertical position that was causing my problems.
Steve.
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