B + W = SUPER QUALITY FROM GERMANY ;-))

positive:

+ Very good quality (processing thread + = tip)
+ Protects my glass against external influences
Found + no negative impact on the image quality
+ Lens cap can be just in conjunction with a better use geli (by the projection)

negative:

- Expensive (good has its price)

Conclusion:

great fabrication and Class Protection for objectively. already had negative experience with a "more favorable" filter but the thread was a disaster so I prefer a bit more pay in future ;-).