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<title><![CDATA[EC21 Product Catalogs - optical flat]]></title>
<link><![CDATA[https://www.ec21.com/ec-market/optical_flat--271307/1/optical flat.html]]></link><item>
<title><![CDATA[Plano-Concave Lens]]></title><link><![CDATA[https://opticreate.en.ec21.com/Plano_Concave_Lens--11182309_11210014.html]]></link><description><![CDATA[Optical Lenses with negative focal lengths. Opticreate PCV Lenses 
should be oriented with the plano, or flat, surface towards the desired focal plane. Plano-Concave Lenses
are ideal for beam expansi]]></description><pubDate><![CDATA[20240710]]></pubDate></item>
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<title><![CDATA[Corner Cube Prism]]></title><link><![CDATA[https://syccooptics.en.ec21.com/Corner_Cube_Prism--11952878_11952883.html]]></link><description><![CDATA[Flatness:
-λ/4 on big surface, λ /10 on other surfaces
Clear Aperture:
&gt;80%
Surface Quality:
60/40（General),10/5(High Precision)
Bevel:
0.1-0.5
Coating:
Uncoated
Optical glass prisms are availabl]]></description><pubDate><![CDATA[20240617]]></pubDate></item>
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<title><![CDATA[Optical Reflectors]]></title><link><![CDATA[https://bill2021.en.ec21.com/Optical_Reflectors--11096792_11096995.html]]></link><description><![CDATA[All kinds of bespoke optical reflectors:
Dielectric HR mirror
Metallic mirror
Our products mainly consist of optical lenses, prisms, optical windows, precision flats, waveplate, optical filters, cust]]></description><pubDate><![CDATA[20200407]]></pubDate></item>
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<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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<title><![CDATA[Optical Low Pass Filter]]></title><link><![CDATA[https://zhaksehtm.en.ec21.com/Optical_Low_Pass_Filter--10153476_10153508.html]]></link><description><![CDATA[OPTICAL AXIS DEVIATIONS : +/-60 FOR DESIGNED ANGLE.
FLATNESS : WITHIN 3 NEWTON RINGS
SCRATCHES : LESS THAN 20 MICRO METER
LAYERING COUNT : 1-7 SHEETS
TRANDMISSION CHARACTERISTIC : TO BE DETERMINED BY]]></description><pubDate><![CDATA[20200831]]></pubDate></item>

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