Astrophotography is possible with a Dobsonian and equatorial platform!
I’d been frustrated by the lack of ability for my Zhumell Z10 10″ Dobsonian reflector telescope to track the night sky. After MUCH research, I found that the cheapest way for me to get basic (and automatic) sidereal tracking is to build (or buy) a motorized equatorial platform, which required absolutely no modification to my Dobsonian telescope. The best part about it all is that it WORKS! Just point it to the celestial pole (north or south), level it, sit the scope on top, turn on the motor. Done. Here is my build, in pictures.
Oh, so you need proof? Well, in late 2012 I started with astrophotography with this setup, and these are a few of the shots I managed to get with it — some of my first astrophotography, ever! It’s by all means not a wonderful example of AP, but at the time, it was amazing to me!
You can also download my old SketchUp plans right here, if you want. It might give you an idea of what I was getting at!