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Hi Pete
Contrary to what Chris says forget about EQMOD at this stage You will need to install ASCOM then EQMOD and get a EQDIR cable and then Install Stellarium scope. Although you can bypass the EQDIR cable by using the PC direct mode if you have the standard supplied RS232 cable.
Stellarium will drive the Synscan directly via a comport using the synscan driver or the nexstar. If you haven't got a comport a USB to Com converter is easy to install.
That 250mm lens should work great for wide field and you should be able to use at least 30 second subs. Trevor did this with a canon 1000d camera mounted on an ETX125 unguided and got some great pictures.
Barry
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