These photographs were taken using a long
telephoto lens, with a mount enabling the lens (not the camera) to be
fixed to a tripod. Loosening the collar of the fitting allows the lens and
camera to be rotated around the lens axis – like turning an oversized
screw.
Taken at low light levels, an exposure time of 5 to 15 seconds gives
sufficient time to rotate the lens through 360°.
A photograph of a number of static lights gives an image with regular
concentric circles. However, rotating the lens causes slight movement of
the tripod and thus the circles are a little wavy.
Photographs of static lights combined with moving lights, such as those on
a vehicle, produce images with regular concentric circles plus irregular
streaks of light running in various directions, including out of the
frame. |
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