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Dr Alan Potts



Location of Photo:

Newport, South Wales, UK

Date/Time of photo:

25th January, 2018


300mm lens at f/5.6 on Nikon D3300 DSLR


A 10m 40s startrail image of Polaris and the North Celestial Pole (NC). The NCP is slowly getting closer to Polaris due to precession. Here, at present, it is some 39.5 arcminutes distance.


Image of acnomad


October 18, 2019 at 1:51 pm

Up until recently, all of my circular star trails photos have been made with a wide angle lens. This morning, I made an image with a 55mm lens and noted that Polaris seemed to be missing. Upon further reflection, I'm starting to realize that Polaris is not as precisely co-located with the Celestial North Pole as I had thought. Thus, I presume, it appears off center in images taken with longer focal lengths. In examining your image shot with the 300, is that large bright object located at approximately the 8 o'clock position Polaris?

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