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Title: Defective Filter
Review: I ordered this filter to primarily protect the lens on my new Nikon D300s. It was extremely difficult to start the filter on the Nikon 18 -200 mm VR zoom lens. It wanted to cross thread and after finally getting to start threading it would bind at and then loosen with each turn. I thought it could be the threads on the lens but after trying another filter I was apparent the Sigma was the problem. For the price I would expect much better quality control in manufacturer. Essentially junk in my opinion. Be extremely careful installing on your lens, if you purchase this Sigma, as you can easily cross thread ruining the lens in the process. Returned to Amazon.
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