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<title><![CDATA[EC21 Product Catalogs - optical wedges]]></title>
<link><![CDATA[https://www.ec21.com/ec-market/optical-wedges--271307/1/optical wedges.html]]></link><item>
<title><![CDATA[ND Filter Neutral Density Filter Camera Lens ND Filter]]></title><link><![CDATA[https://june20210728.en.ec21.com/ND-Filter-Neutral-Density-Filter--11547959_11548058.html]]></link><description><![CDATA[optical density (D) 
which is defined as the logarithm to the base 10 of the reciprocal of 
the transmittance (T): T=10-DSpecificationClear Apeture80%Surface Quality60/40WEDGE&lt;3 arcminTolerance+/-0.1]]></description><pubDate><![CDATA[20230922]]></pubDate></item>

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