{"product_id":"player-one-erf-1-25-filter-s-series-for-quark-chromosphere-erf125","title":"Player One ERF 1.25″ Filter S-series for Quark Chromosphere (ERF125)","description":"\u003ch2\u003ePlayer One ERF 1.25″ Filter S-series for Quark Chromosphere\u003c\/h2\u003e\n\u003cp\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\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: 微软雅黑;\"\u003e\u003cstrong data-spm-anchor-id=\"2013.1.0.i1.44c7454dwNdx9O\"\u003e1.25inch 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 intended to reject energy and extend the life time of your Quark\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e1.25″ ERF filter must be used on\u003cstrong\u003e 5″ 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\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 1.25″ 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 data-mce-fragment=\"1\"\u003eSpecifications\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\u003eMount:\u003c\/strong\u003e 1.25 inch, thread M28.5*0.6\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 body 5mm+ thread 2mm, a total of 7mm\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 2mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-section=\"4\"\u003e\u003cstrong\u003ePV:\u003c\/strong\u003e 1\/4 lambda\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 ≈99%\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 OD2 (300nm-1100nm)\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlayer One ERF 1.25″ Filter S-series for Quark Chromosphere (ERF125)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/player-one-warranty?_pos=1\u0026amp;_psq=player+one+warranty\u0026amp;_ss=e\u0026amp;_v=1.0\" target=\"_blank\" rel=\"noopener\"\u003ePlayer One's 2 years warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":43981986136293,"sku":"POA-ERF125","price":69.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/player-one-erf-1-25-filter-s-series-for-quark-chromosphere-erf125-astronomy-plus-1.webp?v=1690489426","url":"https:\/\/istronomyplus.com\/products\/player-one-erf-1-25-filter-s-series-for-quark-chromosphere-erf125","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}