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Hi Lee
A similar thing happened to me a long time ago, when I was using an SBIG proprietary function labelled “Track & Accumulate” with the SBIG cameras/software.
The SW, on the fly, stacks each sub-frame even though the mount is not auto guiding and the end result is that you obtain a combined image of say, 20 x 90 sec but it is not full frame. The image area is defined by the common area of overlap of all the sub frames and the non common regions outside the overlapped area (caused by drift) are discarded.
It was under such conditions I had similar streaks to you, as each sub-frame was shifted relative to its successor due to (small) tracking drift. This is probably a complete red herring though, as you were auto guiding?
Cheers
Dennis
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