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Thanks for all the comments guys. I'll have to rig up my WO 80mm refractor on the C9.25, so I can plug the ST7 into the refractor and then have the DSLR at prime focus in the C9.25.
The Ghost of Jupiter was taken using the Pentax *istDS and some Pentax software on my PC which allowed me to take the 8 x 30 sec images automatically. The maximum exposure is 30 secs using this technique, and then the Pentax automatically takes a 30 sec dark frame and subtracts it, in camera. So, I had to set the interval between exposures to 1 ½ minutes; 30 secs for the exposure, 30 secs for the dark frame and 30 secs for the in camera processing and download onto the computer.
If I can have the WO 80mm and ST7 combo auto guiding, I can then use the bulb setting on the Pentax and take longer exposures. This should hopefully remove the slightly elongated stars you can see in the posted image.
So much to do. So little time.
Cheers
Dennis
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