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Hi Steve,
I am not especially familiar with dobs goto, but every goto scope i've seen (tracking scope) comes with a database of objects the scope is able to automatically point to - this is the point of the goto after all!
Now, maybe some scope are only able to track and not goto? I have never came across any, except maybe for personal realisations or eq tables for dobs.
For dobs, I am not sure i would like to have a goto system though. Unless it can easily be disengaged. One of the beauty of the dob is its ability to be pointed anywhere in the sky just by hand without having to use motors. I believe a goto system would prevent that unless it can be disengaged and re-engaged in a flash or unless a clever system has been developed.
Push to systems can be acquired separately and installed on compatible scope.
Sorry i do not know enough about dobs to give a better advice but i hope it somehow helps.
And I have to agree - push to are great! Just have a close look at what the tracking let you do (able to move the scope my hand or not).
Sylvain
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