The filter is very high quality and is great from the feel, fits perfectly on my 55 1.8 from Zeiss and looks great.
In the first test images, no difference at the edge, or else at the quality of the images can be seen with and without a filter I do not see any differences.
What bothered me a little, was:
1. that the filter was slightly dusty, but I could do with the bellows immediately. Otherwise, no scratches or other can be seen.
2. the provided case is a couple sizes too big for the filter, making it back and forth plays in Case.
It does not matter, because the filter is actually 99% on the lens, but it might have been different even solve.
The lens cap and lens hood fit without problems back to the filter / lens on it - no restrictions.