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If you do get the sky-watcher one. Make sure to take the 9V battery out when it is not in use. It drains the 9v battery even when your not moving the focuser. I recently threw out my Skywatcher focuser /w the electronic focus and replaced it with a GSO 2 speed and a nice large wheel for the fine focus knob. I can fine focus with a gentle touch from my pinky finger.
I can also tell you right now that the sky-watcher focuser cannot handle moving 4.5 kilo's of equipment without slippage. They are just not made to the precision required for such an exercise. An ES Coma corrector and ES14mm 100 eyepiece is ~ 1.6-1.8 kgs and it struggled with just that.
Your going to want a JMI, Moonlight or Starlight Instruments(Feathertouch) solution if you want to hang 4.5 kilo's.
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