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A full 180° star trails around Polaris can be
obtained in a limited period of the year, near the winter solstice.
WARNING: staring at this photo may make you dizzy!
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| Optics | Sigma 18-200 objective |
| Focal Lenght | 18 mm |
| Focal Ratio | f/6.3 |
| Exposure Time | 708 single exposures of 60 s |
| Digital camera |
Canon EOS 350D |
| Sensitivity | 400 ISO |
| Location | Tradate (VA) at 305m |
| Date and time of exposure start | 28 december 2007, 17.40 UT |
| Mount | Fixed tripod |
| Tracking | - |
| Temperature and humidity | T=-1°C, RH=70% |
| Notes | Sum of the single images with ImageStacker |
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