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Minolta Portrayer Filters - rough surface

Started Jul 19, 2018 | Discussions thread
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rambling robin
rambling robin Senior Member • Posts: 1,196
Minolta Portrayer Filters - rough surface

Hello

I would be grateful if anyone here can assist with a question please. I have come across a boxed set of 3 Minolta Portrayer filters P1 - P3.

I am puzzled that the side of the filters next to the case feels rough. Each filter has different sized 'blobs' in the glass, seemingly designed to be there as the size changes according to the filter number.

Is the rough surface part of the design of the filter?

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