Hi Danny
Welcome to IIS
Your dobsonian is best left as a visual telescope as the cheapest equatorial mount that would support it for astro photography would cost you much more than an arm and a leg.
If you are good at photography and you want to try your hand at astro photography your cheapest way out would be a EQ6 mount with a 5/6" newtonian, ED80, an orion autoguider. You can then use a cannon EOS of some sort as a main camera.
Later you can progress to a better mount eg G11, EQ8, PMX, PME that can take a larger OTA like an 8" short tube newtonian or a 8" SCT if you want to do planets. A specialised CCD with cooling will also be the way to go.
Barry
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