You are suggesting a kind of double exposure?
Some long stripy lines where the camera was moved quickly at the beginning or end of the exposure , then the rest of the stars exposed for the remainder of the exposure. Makes sense. Normally I see vibration but I can see how two different movements could cause this. Moved the camera before the end of the exposure or slipped on the post as it started.
Quote:
Originally Posted by mental4astro
The reason why they are not perfectly parallel is very easy. Think of this: The camera is leaning on an angle on the post. As it slips, the camera is not only rotating, but also sliding out. This explains not just the curve, but also the change in the radius of the curve, and the difference in the curve from the left side of the picture to that of the right side. This last difference being due to the size and shape of the camera, with that part highest on the post rotating more than the far side which essentially just slid out laterally with very little rotation.
Alex.
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