Customers most agreed on the following attributes:
This filter was intended to be used on a Tokina 16-50mm lens. In researching and reading reviews on lens/filter combinations there are many people who have run across vignetting and other undesirable attributes to certain lens/filter combinations.
There have been no problems thus far. Factory and after market lens caps fit perfectly, no vignetting and the clear optics of the Tiffen UV filter help me to capture consistently clear images.
Works fine at protecting the lens glass and cutting UV's. The lens cap doesn't fit tightly.
I bought several Tiffen UV lenses and was disappointed to see that one of them had tiny bubbles in the glass. The bubbles are very near the edges of the filter and don't degrade my photos. However, I suspect that the quality of Tiffen lenses is hit or miss, and that some may my have more noticeable defects, like bubbles in the middle of the glass where they will cause problems. I never saw this problem with Hoya filters I used previously.