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... obwohl trocken, bei 'Zimmertemperatur' zw. 21°C  und 24°C, dunkel, in der Original-Filterbox, in der Schublade zusammen mit den Objektiven gelagert ...

Was mag die Ursache sein? Alterung der Filters?

 

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Hallo Andreas,

Ich muss diese auf English erklaren.

A polariz.ing filter is a sandwich made of 2 pieces of glass with the polarizing material in between. All pressed together.

Sometimes the polarizing material between the 2 glass pieces degrades & needs to be replaced.

Sometimes when this happens the filter can look like the filter in your photo.

Some polarizing filters can be opened & new polarizing material can be used to replace the old degraded material.

Grusse,

Michael

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