Spots on the seonsor: tip on cleaning?

Started Jan 28, 2012 | Discussions thread
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Joseph T Lewis III Senior Member • Posts: 2,887
Re: Spots on the seonsor: tip on cleaning?

The higher the f stop number, the more visible sensor dust spots become. As another poster said, taking a shot of the clear blue sky at f/20 or f/22 is pretty much the standard test to see whether or not you have foreign matter on your camera's sensor.
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Tom

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