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Thanks guys, I know for a fact that an ST-4 type unit should work with my set up and an OAG as the guy that builds the NGT scopes at JMI uses this set up and recommends it, I just did not count on the ST-4 being discontinued when I bought the scope.
Wanting to avoing a guidescope option at this stage as the scope is on a truss tube, so although it may be possible it will involved re-engineering the telescope and considerable expense.
So I guess the question is which unit will be as sensetive or better than the ST-4?
JohnG - in your best estimate what is the faintest stars that you have guided on with your ST-4 would you say?
Eric - thanks for that great info. Do you know how sensetive a DSI is in terms of guidestars?
Lastly, with all these units, how good are they at guiding on oblique objects which can be the case with OAG's?
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