Had not one (caused by the filter) blurry picture, only when I put the MF wrong after a small photo gallery or accidentally fell far without rework. Have the UV filter and the ND2 filter used in combination with the +1 and +2 lenses of Polaroid and was impressed with the results. Every detail was finely säuberlichst recognizable and blurring were placed there where they belonged.
The test pictures with the lens hood were equally satisfactory (no sticker in the 18-55mm lens).