I recently blought a Sigma 10 20 F4 super wide angle lens for my Olympus DSLR and wanted a UV filter to protect the glass. Lots of reviews and forums on the internet warned of the dangers of adding filters, saying that they may touch the lens glass. Well thi is just fine and initial results look good for image quality for a filter at this price. Just right and even looks good on the lens, matching the gold writing. The Sigma lens cap fits snugly too.
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