These filters are made out of high-quality optical glass in which the surface is etched with a fine grid pattern. Depending on the pattern and size of the grid, point light sources and reflections create multi-beam stars. The grid structure of this attachment is designed so that a 6-point star is created from point light sources and reflections. The mount turns to allow the photographer the freedom to decide the orientation of the star effect.
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Comments about B+W 72mm 6x Cross Screen 686 Star Effect Glass Filter:
I was clueless about how the star effect was accomplished, so I bought this filter, it works great in my 18-200mm Nikon lense for my Nikon D-300.
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