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<title><![CDATA[EC21 Product Catalogs - negative]]></title>
<link><![CDATA[https://www.ec21.com/ec-market/negative--271303/1/negative.html]]></link><item>
<title><![CDATA[2023 Free Sample/Inquiry for Drawings Meniscus Lens  Positive/Negative Meniscus Lens]]></title><link><![CDATA[https://oplens68.en.ec21.com/2023-Free-Sample-Inquiry-for--11609135_11609139.html]]></link><description><![CDATA[Negative meniscus lens
The negative meniscus lens is used for applications using infrared materials with a high refractive index. These lenses serve as substitutes for other negative lenses with grea]]></description><pubDate><![CDATA[20230809]]></pubDate></item>
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<title><![CDATA[Aspheric Cylindrical Lens]]></title><link><![CDATA[https://ruiqioptics.en.ec21.com/Aspheric-Cylindrical-Lens--11974301_12019798.html]]></link><description><![CDATA[Negative Meniscus Lenses, cylindrical lenses, accordingly custom-made drawing, we have Zygo detection ensure the precision high precision requirements and more than 10years processing manufacture tea]]></description><pubDate><![CDATA[20241022]]></pubDate></item>
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<title><![CDATA[Double Concave Lens]]></title><link><![CDATA[https://hsgdoptic.en.ec21.com/Double-Concave-Lens--12004331_12019606.html]]></link><description><![CDATA[negative focal length, thereby causing collimated incident light to diverge. The double concave lens/mirror has an equal radius of curvature on both sides of the lens. They are generally used to expa]]></description><pubDate><![CDATA[20241022]]></pubDate></item>
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<title><![CDATA[Custom Quartz Meniscus Lens for Testing /Infared/Laser]]></title><link><![CDATA[https://xinxingliangoptics12.en.ec21.com/Custom-Quartz-Meniscus-Lens-for--11974068_11974186.html]]></link><description><![CDATA[negative focal lengths, they are used for the optics, lasers, medical science, electronics, tele-communication and others.
1. Cylindrical lens with its circumference surface polished.
2. Applicable f]]></description><pubDate><![CDATA[20240724]]></pubDate></item>
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<title><![CDATA[Plano Concave Lenses]]></title><link><![CDATA[https://syccooptics.en.ec21.com/Plano-Concave-Lenses--11952878_11952885.html]]></link><description><![CDATA[Plano concave Lenses
have one concave surface. It has negative focal length. It is often used to expand light or to increase focal length in existing systems.
Plano-Concave Lens Specifications:
Mater]]></description><pubDate><![CDATA[20240617]]></pubDate></item>
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<title><![CDATA[Silicon Windows and Silicon Lenses for Infra-Red Imaging Systems]]></title><link><![CDATA[https://clzoptics.en.ec21.com/Silicon-Windows-and-Silicon-Lenses--7138952_7138961.html]]></link><description><![CDATA[negative focal length and are used to diverge incoming light, or to increase focal length in an existing optical system. They can be used in beam expanders and projection systems.More details about P]]></description><pubDate><![CDATA[20240403]]></pubDate></item>
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<title><![CDATA[Spherical Lens]]></title><link><![CDATA[https://chinastar2009.en.ec21.com/Spherical-Lens--3515571_3523506.html]]></link><description><![CDATA[Achromatic Lens is an achromatic consists of a positive low-index Crown Glass lens element cemented to a negative high-index Flint Glass lens element.
Specification of our achromatic lens as follow:
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<title><![CDATA[Concave Lens]]></title><link><![CDATA[https://jiffoptics.en.ec21.com/Concave-Lens--5677474_5677475.html]]></link><description><![CDATA[Optical bi Concave Lens
Concave lens that possesses at least one surface that curves inwards. It is a diverging lens, spreading out those light rays that have been refracted through it. A concave len]]></description><pubDate><![CDATA[20110729]]></pubDate></item>
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<title><![CDATA[Plano Convex or Concave Square Laser Cylindrical Lens Cylinder Lens]]></title><link><![CDATA[https://worldhawkcindy.en.ec21.com/Plano-Convex-or-Concave-Square--11489283_11489291.html]]></link><description><![CDATA[negative focal lengths, they are used for the optics, lasers, medical science, electronics, tele-communication and others.
1. Cylindrical lens with its circumference surface polished.
2. Applicable f]]></description><pubDate><![CDATA[20240201]]></pubDate></item>
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<title><![CDATA[BK7 Double Concave Lens]]></title><link><![CDATA[https://albrighter.en.ec21.com/BK7-Double-Concave-Lens--10771415_11766090.html]]></link><description><![CDATA[Double concave lens is similar with plano concave lens. The focus length is negative. It can make parallel light diverge outside. The two sides have same radius of curvature. Double convex lens gener]]></description><pubDate><![CDATA[20230407]]></pubDate></item>
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<title><![CDATA[Optical Glass Achromatic Plano Convex Lens]]></title><link><![CDATA[https://ruikeoptics000.en.ec21.com/Optical-Glass-Achromatic-Plano-Convex--11732883_11874236.html]]></link><description><![CDATA[Achromatic Lenses
Achromatic Lenses consists of two positive
and negative lenses with different refractive indices bonded together. They
have corrected for spherical aberration at both axial and para]]></description><pubDate><![CDATA[20231209]]></pubDate></item>
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<title><![CDATA[Double Concave Lens]]></title><link><![CDATA[https://daisydong147.en.ec21.com/Double-Concave-Lens--10848859_10849633.html]]></link><description><![CDATA[A double-concave lens is compose of two concave surface, has a negative focal length and are best used to diverge a converging beam. Similar to a plano-concave lens, a bi-concave lens can diverge a c]]></description><pubDate><![CDATA[20181108]]></pubDate></item>

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