Simple Quality. Optical scrap!

Let's start with a falsehood: The backlight or lens hood called framing is not made of metal but of plastic. Just like everything in this set - is from this plastics - apart from the filter. This need not be a disadvantage, but it would have put a little more emphasis on a clean deburring. Go well together doing everything after all. Make the glass filter per se but a good and uniform impression. Let's see how are the first pictures.

I keep this set only due to the favorable price and I'll use the filter only infrequently. Should anyone want to work frequent hereby, I would refrain from buying!

Edit after first photos:

1. The filters are not made of glass but also of plastic. I gently poked accidentally with the lens hood against a filter, and it actually was a scratch, would not have arisen on glass.
2. The pictures are blurred. Thus, this filter set is quite useless!

Conclusion: Cheapest Yps gimmick!