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"Wide field experts: would the 60mm refractor with ToUcam be enough for autoguiding for wide field on a big enough EQ mount?"
I can't see why not. I use an ST80 (actually a Celestron Nexstar 80), so an 80mm f5 refractor.
If there is anything wrong with your plan it will be lesser light for a guidestar. Make sure you can adjust significantly the guidescope so as to find a suitable guide star, brightness wise.
With wide field, I use a 300mm or shorter camera lens, and with the lens or camera on a ball and socket. this allows a guidestar to be located, and then the camera/lens aligned on the target area.
Gary
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