I recently bought Tamron 17-50mm non-VC lens. How can I verify the lens I received is a good sample without any flaws? What are the tests I can do to verify that?


Please see below image which is cropped from an image taken with the lens. I am worried about the portion marked in the red circle. You can see some flaw there, kind of noise. Is that something related to the particular sample of the lens or is known problem of Tamron 17-50mm?





[img]/resized-image.ashx/__size/550x0/__key/CommunityServer-Discussions-Components-Files/24/2061.Crop.png[/img]


Thanks!


Satheesh