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Thanks ,Martin. I will try that also. I also have a canon 600d and was using its live view with grid pattern to centre the stars. That may not be accurate enough and will have to try a reticule eyepiece. I don't have a guidescope or or guide camera. My telescope is a skywatcher 250 F4. A guidescope might add too much weight to my setup. I have just been trying 30sec to 1min subs, but often get some elongation of my stars. thanks, Rob.
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