Quote:
Originally Posted by OzEclipse
Bob,
The SW 20" dob is a 20" f3.9. When viewing the zenith & looking at the design, I would guess that the eyepiece would be no more than 1.8m off the ground. Most of the time it will be lower. Depending upon your height, it may well be more comfortable than a 12" f5 and you won't need a ladder, maybe a step if you are shorter than 1.8m.
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The 20" has an eyepiece height of 2 meters at zenith. OK we don't often observe at zenith, but the GOTO has extra height added on top of that due to the mechanics of the motors.
Sky Watcher themselves stated that number. Once again a decent ladder is required for these larger Sky Watcher dobsonian's. We don't observe from the tops of out heads.
At least the 20" the focuser is at a 90 degree angle. Some genius thought it was a good idea to have the 18" focusers at a 45 degree angle.