The only one I've had an opportunity to use is a 10" dob at a local star party held by the San Diego Astronomy Association. It was an Orion 10" dob and the views were beautiful! Before trying it, I didn't know if I'd like a dob since the scope I used to have (a C4.5) was on an equatorial mount and offered convenient tracking. A few minutes of use of the dob at the star party changed my mind though. It was very easy to manually track.
If I go with the 10" dob, I'll be going with the Apertura AD10 instead, as it comes with some extra features for about $100 less than the Orion. The 10" dob definitely is the winner as far as optical performance over the XLT 150. It gathers much more light and will show many more details in my light polluted back yard.
There are a couple issues I'm still debating before deciding which to get.
- Portability - the XLT 150 wins over the AD10. The XLT 150 can break down and be stored and carried in a bag, which would be great when going camping with the family or scouts. A 10" dob has a big tube (about 12-14" diameter and 48.5" long) as well as a large base that doesn't break down. Moving from the house to the backyard shouldn't be an issue for either one though, which is where I'll be using it the most.
- Tracking for visual observing and astrophotography - the XLT 150 is on an equatorial mount, so after adding a polar alignment scope and drive motors, tracking could be quite good. I could even add a DIY autoguider in the future. The AD10, being a dob, is basically a manual alt-az mount. There are some options though. I could build an equatorial platform. Who knows, sometime in the future I could even build a split ring mount for it.
Despite these issues, I'm leaning toward the AD10. The much larger aperture is a huge selling point and the tracking issue can be overcome.
I need to drop by OPT and another star party or two before I decide. Who knows, something else might come up.
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