What Looks Like Star Trails But Cant Be

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what looks like star trails but can't be
Taken by Hamish Guthrie on November 25, 2016 @ North of Glasgow, UK

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Two photos taken within one minuteat 22.06pm. One has what looks like 2 hour star trails from SOME of the stars but not all. 30sec exposure at f4.5 at 17mm on canon 5D.second photo is normal.

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Comments

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looks normal for bumping or moving your camera at the start/end of exposure :)

Posted by kb9uwu 2016-12-08 13:52:22

you might have rotated the camera at the start or end of the exposure, as noted by kb9uwu. I processed the image and almost all of the stars do have a trail see
https://www.flickr.com/photos/103726899@N08/30704986093/in/dateposted-public/
The landscape is only marginally affected by the effect,

Posted by iovane 2016-12-08 14:45:31

Thanks for the comments but I have processed this in Lightroom and not all the stars have trails. I may have moved the camera or the lens but would all the stars not then have trails?
There is also a strange straight trail near the last telegraph pole on the right of the picture. Any thoughts on that one?

Posted by HKG43538B 2016-12-09 06:49:40

Hi Hamish, here is my complete hypothesis:
Some stars (a few indeed) are not bright enough to impress the camera sensor with a faint trail.
You might have moved the camera horizontally, more precisely you might have rotated the camera about an almost vertical axis.
You said you were using a wide angle lens, and this distorted (curved) the trails of the stars which were above the center of the fiend of view: the more far from the center of view, the more curved and angled the trail. Details which were not distorted (as you mentioned) were quite close to the horizontal line passing through the center of the field of view. This appened for the bottom part of the scene. Allegendly the frame is cropped.

Posted by iovane 2016-12-09 17:04:20

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