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The DSI II with PHD software ( freeware) and a suitable serial to ST-4 plug will control a HEQ5 mount.
Depending on your computer, you may find ( on new laptops) you only have USB ports. You'll need a reliable usb>serial adaptor ( Keyspan is 100%)
Generally to guide/ image you need two scopes; one for guiding ( a ST80 short focus refractor does well) mounted on the imaging scope, and obviously the imaging scope with the separate imaging camera.
Your 180 Mak, may be a bit slow f ratio for DSO's and the long focal length means narrow FOV and longer exposures.
I use a QHY5/ ST80 for guiding a 10"/ 12" LX200 and a 6" cometracker on the HEQ5.
Hope this helps.
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