22 Degree Halo 90 Minute Timelapse 04/07/21(PID:51289841494) Source
posted by Mary McIntyre FRAS alias spicey_spiney on Sunday 4th of July 2021 02:31:20 PM
Taken from Oxfordshire, UK with a Canon 1100D with Canon 10-18mm lens at 10mm focal length. The camera lens was stopped down to f/22, ISO-100 1/400 sec I first noticed the partial halo at 11:30 BST and I set my camera up to take a photo every 20 seconds for 90 minutes. Around noon the halo was complete and at its brightest. All of the images were processed in Lightroom and the video made using PIPP and Movie Maker 10 22 Degree Halos are the most commonly observed atmospheric optical effect. They are caused by the refraction of light by hexagonal columnar ice crystals in high level cirrus cloud. The crystals don't need any special kind of alignment to produce a halo so they are incredibly common. In fact, from any one location a keen observer will see a 22 degree halo in excess of 200 days of the year. They may not last very long, but they more common than rainbows by a considerable amount!
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