Oh a couple of other things.
An 8" dob will give great views of Saturns rings. Planetary observing with a dob requires a bit of patience as you need to use high magnification and the seeing has to be really good so you just keep pushing the scope until you get that great view.
From what I understand (I am more of a Deep Space guys myself) planets are best seen with a long focal length scope (Schmit Cassegrain or Mak) on a tracking system, but dobs still do a great job. With DSO's (Deep Space Objects if you are not familiar with DSO) dobs excell.
Malcolm
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