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To be really and truely honest with you brett, taking photos of anything bar the moon with a dob mounted telescope and a DSLR will be practically useless sorry to be a buzz kill, you have to look at something like Servo Cat, or mounting the 12" up onto a GEM. Something that is able to be controlled by PC, sure you can do it the old fashioned way by sitting and manually guiding but its not as good as sub pixel guiding.
The key to it all is guiding and low Periodic Error (PE) mounts without that well, its like p155ing in the wind its going to land on your feet.
If you where going to do planetary, you could get away with the dob, but at high magnification which is what you need, its not going to be a easy task.
Good luck hope it all works out for you.
Brendan
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