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Originally Posted by Mark McCall
*Take a photograph of clear blue sky, no clouds. Expose normally, aperture selection does not matter. This will show you
* * *EXACTLY where your spots are on your sensor.
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Agree with the process listed above and have used successfully many times. One small comment though - I have found that the aperature setting does matter. I see the specks much clearer if the aperature is f11 or smaller. If you can see the spots at f2.8 - f8, I'd say that thing's filthy.