Physics:Singh-Ray
From HandWiki
Singh-Ray Corporation, known as Singh-Ray Filters is an American maker of photographic filters based in Arcadia, Florida, and established in 1962.
They are among the more expensive brands and have a reputation for high quality and personalized service. Singh-Ray manufactures some unique filters such as the Vari-ND a 2 to 8 stop neutral density filter and the Vari-N-Duo, a combination of the Vari-ND and a circular polarizer.
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