If your 200mm scope is f/8[=1600mm focal length], you won't get 2 min
unguided subs, even with PEC. My 200mm f/5 gets consistent 75-90 secs
[depending upon the declination of the target], and a small percentage of
usable subs out to about 100-110 secs.
Scope movement obviously caused the blip in your animation. Could be
caused by R.A. clutch slippage, or more likely the scope was too well balanced, rather than balanced slightly against the drive direction, so the
scope could flop around within the confines of any backlash present in the
gears or the worm.
raymo
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