Creating Etherial Long Exposures With Breakthrough Photography's X4 ND Filters | Mark Hilliard Atelier's Blog
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Breakthrough Photography launches ultra-slim UV and ND filters: Digital Photography Review
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X4 Neutral Density – Breakthrough Filters
Breakthrough X4 Neutral Density Filters - Camera Jabber
Breakthrough Photography X4 Neutral Density Review
Breakthrough Photography's GND and ND filters are the first made with tempered glass: Digital Photography Review