Circular spots on images with Canon 500mm f4.0 IS

Started Jul 18, 2012 | Discussions thread
liquidstone Forum Pro • Posts: 10,057
How to eliminate the lens as the culprit

Those are sensor dust spots.

If you wish to eliminate the lens as a possible cause of the issue, shoot the sky at f/22 with two or more different lenses. If the spots remain in the same places even with lens changes, you know it's the sensor.

wdcarrier wrote:

Thanks to all for your assistance. I am in the process of checking the camera sensor. For your edification, here is a portion of Canon's response after suggesting it could either be the lens or the camera: "…please forward your lens to the Factory Service Center shown below. You are not required to send any accessories or manuals when shipping the lens…Upon arrival at the Factory Service Center, your lens will be logged in to our repair database and assigned a repair number. Next, the lens will be visually inspected and you will be advised of the findings." Sounds like a bunch of money to me.

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