Hello! We're a filter manufacturing company from San Francisco.

We design and manufacture the worlds sharpest and most color neutral ND and CPL filters. Guaranteed.

Links
https://breakthrough.photography/products/x4-neutral-density
http://www.the-digital-picture.com/Reviews/10-Stop-Neutral-Density-Filter.aspx
http://www.definitionmagazine.com/journal/2015/6/13/review-breakthrough-photography-x3-traction-nd-filter
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Angela Choi
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Graham
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Craig Blair
Dr. Craig Canon
David Graham Clark
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