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Rubbish masqurading under a previously good brand name.
on 19 January 2016
First of all digital cameras unlike film are not sensitive to UV so the only use is to keep crud of the front element of the lens. Problem with this item is that I found this filter extremely difficult to clean successfully if anything did get on the glass.
On my Canon 100-400mm L lens focus was clearly affected.
After a very short time small defects in the coating were visible.
I feel that image quality was slightly affected though I've not specifically tested this, as the previous problems had already ruled out using the filter any more when I inadvertently left it behind somewhere in India (Otherwise I'd have returned it).
I note that these filters are now selling for a fraction of the original price. Guess Why?