Canon 60d problem

Smmit

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Hi

Need help

After shooting some long exposures, I found that some had a 'ring' of spots on them. These were taken on a 17-55mm lens at 55mm. I have since tested a 55-250 lens and found the same problem.

What is it??

Thanks

PS How do you get permission to add attachments?
 
If you were shooting long exposures, it's possible you were also using a high f stop. That makes any spots/dust on your sensor more apparanrt then if you shot more wide open.

Just a guess without seeing the image
 

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