Thank you for your comments, great help.I use ND-PL filters. But they have to be rotatable. Mostly I use vertical adjustment. But in the morning / evening with side light I need horizontal adjustment. Since I have the combined filters, I no longer use the simple ND filters.
My first PL filter was not adjustable. To adjust, I had to loosen the thread something. As a result, he was lost during the flight. Everything is perfect with the new, adjustable filters!
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