Jeff Terry's Astrophotos/venustransitseeing.jpg

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Seeing may play an imporant role in the famous black drop effect.
These were three consecutive images, I see a black drop in image 2
but not in image 1 or 3. Venus is noticably blurred in image 2 as well.
The blurring must have been due to a change in seeing. The total time between
first and last shot was 20 seconds.