Installation: Rotate top finish. Direct fixed no wobbling. So all the best.
Processing: Well. It was directly times a crack / dirt in the lens thus unusable. Quality Control?
Big kudos to photo-morning GmbH these have no major to complain about a replacement filter sent.
Otherwise, I guess that's a good product for people who want to protect your lenses.
Image quality: So after I tested the whole time, I realized that as well as all pictures Refektionen it had reason: the glass is not anti-reflective. Light passes through the filter onto the lens (this Reflects something) -> light goes back to the Filter -> this refects the light back to the lens
thus double exposure. Other filter it with anti-reflective coating -> No problem!
Sorry but for that I can no longer give as 2 points.
Greeting
David