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Forum: Photographic Technique
10-28-2009, 04:54 PM
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I bet that the lens changed focal lengths during exposure. You had the lens pointed up. You probably started off with a higher zoom. Then, the weight of the lens pushed it down. Looks like it happened more than once. Was the edge of the roof originally in your frame? Why did you choose 24mm? Wasn't it because you wanted to keep the roof out of your frame? Then, during exposure, it probably crept down to 16mm, maybe stopping around 20mm for a while :-)
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