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Old 07-19-2009, 03:48 AM   #5
Terri Kennedy
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Join Date: Oct 2003
Carmudgeonly Ride: 2003 BMW 325xiT; looking for a new fun car
Location: New York
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Quote:
Originally Posted by Sharp11 View Post
The sensor issue: Are these the "spots" you're referring to? I don't know what they are - they're on every zoom shot, some regular shots, but not others and they're not on any of the non-polarizer shots. If it's a sensor issue, wouldn't the spots be there all the time? I'm asking because I really don't know
They could be on the sensor or they could be on any of the intermediate surfaces (such as on / in lenses, filters, etc.). A good way to find them is to take a picture of a cloudless sky. If you have a zoom lens, take 2 shots with the second having the zoom ring turned maybe 1/4 turn. If the spot moves, it's toward the front of the lens. If it is stationary, it is toward the back of the lens or on the sensor.

Because they're much closer than anything else in the image, they're usually out-of-focus. Taking pictures in bright sunlight will make them more distinct as a narrower aperture will give greater depth of field.

Here's an example:



from this image:



[Yes, I know there are more dust spots on the full image ]
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