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Strange star elongation problem
I was ready to start imaging last night, and took a 10sec sub of the Jewel Box for framing purposes, and found the stars very elongated. Intrigued, I took shorter and shorter subs to see when the elongation began to show itself. I got down to 1/60th sec at ISO 6400, and the stars were still elongated. Everything from the tripod to the camera was firmly in place as usual, and of course the shutter was fired remotely. Anyone got any ideas how this could be happening. The R.A. motor was running, and even if it wasn't, I should be able to get round stars for longer than 1/60th sec.
raymo
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