Check out the weird double effect of the moon, I took this tonight with my Digital Rebel and Canon 28-135 IS lens. The IS was off as the camera was on a tripod. I took about two dozen shots and this was the only one to exhibit this artifact. Picture details: 3.20 sec exposure, 9.0 F-Stop, ISO 800, 135mm focal length. I cropped the picture in PSE. This was one of the longer exposures. Any thoughts on why this one has the artifact?
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