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Old Mar 30, 2005, 10:38 AM   #1
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I was out last weekend with my tripod, EOS 20D with 28-135mm USM IS lens shooting a photo of a power plant at night. I noticed that with that with a shutter speed of 30 seconds the light appear to be in a star pattern.

With shutter speeds faster than 30 seconds the lights were just points of light. I have the custom function of noise reduction on and my be this is why it did it???? But I had it on with the other shots too??

I like the effect it had. And it saves me from buying a 77mmstar pattern filter.

Any Ideas of why it causes a star pattern??

The photo with the stars can my found at:

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Old Mar 30, 2005, 11:01 AM   #2
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Your image exif is removed so I can't check, but my guess would be your aperture closed down to a verytiny opening by the time you got to a 30 seconds shutter. Note the shape of the star pattern, I bet it matches the number of leaves that make up the aperture mechanism.

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