{"product_id":"player-one-erf-2-filter-s-series-for-quark-chromosphere-erf2","title":"Player One ERF 2″ Filter S-series for Quark Chromosphere (ERF2)","description":"\u003ch2\u003ePlayer One ERF 2″ Filter S-series for Quark Chromosphere\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003ePlayer One S series filter using high quality optical glass substrate and multi-layer composite coating technology, which has excellent optical performance in astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong data-spm-anchor-id=\"2013.1.0.i1.44c7454dwNdx9O\"\u003e2 inch ERF filter ( Energy rejection filter for Quark Chromosphere）\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis filter is an assistant filter, design for Quark Chromosphere (Ha verstion) ,\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003eintend to reject energy and extend life time of your Quark\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e2″ ERF filter must working on\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e6″ or smaller refractors.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003e(DO NOT use it on eyepiece for observing)\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ERF-curve-1024x441.png?v=1718292778\u0026amp;width=700\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy add an ERF on Quark?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFirst filter on Quark is quite small, the solar disk might bigger than it, the light will heat the filter and it’s holder. With this 2″ ERF filter, we can protect both the filter and filter holder from high temperature.\u003c\/p\u003e\n\u003cp\u003eAnd don’t worry about the ERF itself, it’s use B270 transparent glass and multi coating, it will reflect not absort most energy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it has any other usage?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, this ERF filter also can be used in Lunar imaging, it will provide even brighter image than IR685 filter, also could improving the seeing.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003cp class=\"tgt\" data-section=\"0\"\u003e\u003cspan class=\"tgt\" data-section=\"0\" data-sentence=\"0\" data-group=\"0-0\"\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2inch, thread M48*0.75\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"tgt\" data-section=\"2\"\u003e\u003cspan class=\"tgt\" data-section=\"2\" data-sentence=\"0\" data-group=\"2-0\"\u003e\u003cstrong\u003eFrame thickness:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebody 5mm+ thread 2.5mm, a total of 7.5mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"tgt\" data-section=\"4\"\u003e\u003cspan class=\"tgt\" data-section=\"4\" data-sentence=\"0\" data-group=\"4-0\"\u003e\u003cstrong\u003eThickness of filter lens:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2.5mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-section=\"4\"\u003e\u003cstrong\u003ePV:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1\/4 lambda\u003c\/p\u003e\n\u003cp data-section=\"4\"\u003eBandwidth:\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"tgt\" data-section=\"6\" data-sentence=\"0\" data-group=\"6-0\"\u003e≈60nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"tgt\" data-section=\"6\"\u003e\u003cspan class=\"tgt\" data-section=\"6\" data-sentence=\"0\" data-group=\"6-0\"\u003e\u003cstrong\u003eTransmittance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e97%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"tgt\" data-section=\"8\"\u003e\u003cspan class=\"tgt\" data-section=\"8\" data-sentence=\"0\" data-group=\"8-0\"\u003e\u003cstrong\u003eBlocking depth:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eOD4 (200nm-1100nm)\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlayer One ERF 2″ Filter S-series for Quark Chromosphere (ERF2)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003ePlayer One's 2 years warranty\u003c\/p\u003e\n\u003c!----\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":52184008884453,"sku":"edf1787937589265","price":70.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/4561\/8405\/files\/player-one-erf-2-filter-s-series-for-quark-chromosphere-erf2_1.png?v=1787937593","url":"https:\/\/perovia.shop\/products\/player-one-erf-2-filter-s-series-for-quark-chromosphere-erf2","provider":"My Store","version":"1.0","type":"link"}