{"product_id":"optolong-nd3-0-astronomical-solar-filter-neutral-density-filter-nd-filter-for-transmission-reduction-2-inch-1-25-inch","title":"OPTOLONG ND3.0 Astronomical Solar Filter Neutral Density Filter ND Filter for Transmission Reduction 2-Inch\/1.25-Inch","description":"\u003cp\u003e\u003cb\u003eIntroduction:\u003c\/b\u003e\u003cbr\u003e- Neutral Density (ND) filters are designed to reduce transmission evenly across a portion of a specific spectrum. ND filters are typically defined by their Optical Density (OD) which describes the amount of energy blocked by the filter. A high optical density value indicates very low transmission, and low optical density indicates high transmission (Equations 1-2). ND filters can be stacked to achieve a customs optical density. To calculate the final system OD, simply add the OD of each filter together.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- Substrate: optical glass\u003cbr\u003e- Thickness: 1.85mm\u003cbr\u003e- T=0.1%\u003cbr\u003e- Surface quality: 60\/40\u003cbr\u003e- Transmitted Wavefront RMS: λ\/4\u003cbr\u003e- Parallelism: 30s\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-01.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-02.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-03.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-04.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-05.jpg\"\u003e\u003c\/p\u003e","brand":"OPTOLONG","offers":[{"title":"2-Inch","offer_id":41132947734577,"sku":"103573","price":23.64,"currency_code":"USD","in_stock":true},{"title":"1.25-Inch","offer_id":41132947767345,"sku":"103574","price":31.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0578\/4790\/6353\/files\/103573-1.jpg?v=1784700714","url":"https:\/\/www.thanksbuyer.com\/ja\/products\/optolong-nd3-0-astronomical-solar-filter-neutral-density-filter-nd-filter-for-transmission-reduction-2-inch-1-25-inch","provider":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products,  Audio Amplifer and Decoders","version":"1.0","type":"link"}