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Hi Kirkus.
What did you want to photography? Planetary/Lunar, or deep-space images?
If it's webcam, that pretty much limits you to solar system objects (moon and planets). For that purpose, an EQ platform will do the job well and will fit within your budget. It also keeps the 10" dob in a perfect position for visual observing.
Alternatively, you could get an EQ6 (I think they're called Atlas EQ in the USA), and mount your 10" tube on it. You can keep the dob base for visual observing, and chuck it on the EQ mount for photography.
The EQ platform can't be used for deep-space photography because it's just not accurate enough in its tracking. The EQ mount will be accurate enough for both planetary and deep-space imaging - should you decide to get a DSLR in the future.
The other consideration, is that your 10" newt by default probably won't allow a DSLR to come to focus (not enough in-focus) at prime focus. So you'd probably need to move the mirror up the tube.
So, having said all that - for lunar/planetary photography with a webcam, the EQ platform will do the job. I used one with my 10" dob for 18 months, with a ToUcam and 5x powermate, and got very good results on the moon and planets.
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