At the processing of the metal body, I can not detect any error, the course, a soft curve to something beyond the center does not look perfect. One might think to look at very precise, it is coated with soot like a candle on a glass. Another example of Hama filter has compared a perfect trip. Of course, there was no soot, but in the coating can be seen little irregular halt gradations.
When finished photo was to see them, however, nothing more.
Professional filters are determined spotless but costs more than five times as much. Also concerning stray light and reflections nothing negative I noticed.
+ 1 iris ranges from the way completely and is clearly noticeable.
So if you want to spend a hundred euros (after 1/5 of the price of an SLR !! :)) for a graduated filter which pays absolutely for landscapes, which is well advised with the purchase of this filter.
I hope I could help you to get an accurate picture of the filter.
