Distorted Lunar Corona

This pair of images taken less than a minute apart shows how droplet sizes can vary within a cloud. Very thin cloud moved across the moon from the lower right. The droplets near the edge of the cloud, upper left in the first image, were slightly smaller. This gave a slightly larger radius to that part of the corona. In the second image, near the middle of the cloud, the corona appears almost circular.
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	The hint of a third ring, to the lower right in the first image, indicates that the droplets in that area were very similar in size. Despite that there is a smooth change in mean size between different parts of the cloud.
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Canon EOS 20D 15th December 2005
Wiltshire, England