Apparently I caught a typical Monday parcels films with production error. The Janus-Net team has then very nice set with me and provided me with both a packet of matt and clear films, which are flawlessly. I want to thank hereby once again for the quick and easy solution.
The films now obtained no longer cause the effect first described and work wonderfully. For your reference, I'll be the first negative review in the lower part of the attach positive, but this is considered to be no longer valid (except for the positive points)!
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+ The sheets fit well
+ Very stable
+ Not too expensive
But:
The image quality on my Galaxy Tab 10.5 S deteriorates dramatically. The films have a kind of rough surface, the picture may appear distorted and it looks as if the whole display covered with streaks. The effect is so extreme that I bought a competing product as reading and watching videos is a torment.