Damien, the QHY5 is a dedicated autoguider which is why it has the ST4 port on the back. The DMK camera's are planetry imagers which is why they do not have a ST4 port on the back. That said if you used the DMK as a guider you will need to direct the correction signal via a laptop and GUSB to convert the signal into a langauge the mount understands. You do not need this with the QHY5 which can be plugged directly into the mounts autoguider port.
Mark
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