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Pulse guiding is theoretically better than ST4 but there seems to be a lot of conjecture and long threads out there on this. I personally pulse guide, the difference in setup is when you choose the Mount in PHD you select Either the EQMOD ASCOM or ZWO USBST4 option (and have the appropriate cable(s) connected, just your eqmod/serial HC cable for the EQMOD option and/or RJ connection from the camera guide output to your mount's guide input for the ZWO USBST4 option).
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