{"product_id":"antlia-ch4-methane-filter-1-25-ch4-125","title":"Antlia CH4 Methane FIlter - 1.25\" - CH4-125","description":"\u003cp\u003e\u003cspan\u003eThe Antlia methane (CH4) filter is a specialized filter that allows light in the \u003c\/span\u003e\u003cspan\u003enear infrared portion of the spectrum centered \u003c\/span\u003e\u003cspan\u003eat \u003cstrong\u003e889nm\u003c\/strong\u003e to pass through \u003c\/span\u003e\u003cspan\u003ewith a bandpass that is \u003c\/span\u003e\u003cstrong\u003e20nm \u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003ewide.\u003c\/strong\u003e \u003c\/span\u003e\u003cspan\u003eThis filter was developed in \u003c\/span\u003e\u003cspan\u003eorder \u003c\/span\u003e\u003cspan\u003eto \u003c\/span\u003e\u003cspan\u003emeasure finer \u003c\/span\u003e\u003cspan\u003edetails \u003c\/span\u003e\u003cspan\u003eand \u003c\/span\u003e\u003cspan\u003emore \u003c\/span\u003e\u003cspan\u003econtrast \u003c\/span\u003e\u003cspan\u003eof the methane \u003c\/span\u003e\u003cspan\u003ethat \u003c\/span\u003e\u003cspan\u003eis \u003c\/span\u003e\u003cspan\u003echaracteristic of \u003c\/span\u003e\u003cspan\u003eJupiter, Mars, Saturn and other planets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe human \u003c\/span\u003e\u003cspan\u003eeye \u003c\/span\u003e\u003cspan\u003eis not \u003c\/span\u003e\u003cspan\u003esensitive to light beyond about 700nm hence no \u003c\/span\u003e\u003cspan\u003eperson can \u003c\/span\u003e\u003cspan\u003esee what \u003c\/span\u003e\u003cspan\u003eis transmitted by this filter, so this filter is not \u003c\/span\u003e\u003cspan\u003esuitable for visual applications.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Methane (CH4) filter is recommended for planetary imaging such like Mars, Jupiter, Saturn and the other planets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eIn order to produce good results, you are likely to require relatively longer exposures times and larger aperture telescopes with this filter than with other filters.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical substrate\u003c\/li\u003e\n\u003cli\u003eThickness: 1.25” (2mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/li\u003e\n\u003cli\u003e30 arcsec parallelism\u003c\/li\u003e\n\u003cli\u003eCenter-Wavelength of Antlia CH4 filter: 889nm\u003c\/li\u003e\n\u003cli\u003eTave＞90% , 90% transmission at 889nm\u003c\/li\u003e\n\u003cli\u003eOD5（0.001%）@ 200-1050nm\u003c\/li\u003e\n\u003cli\u003e2 sides Multi-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eSingle \/ Non-glued substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1.25”( 28.5*0.6 )\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cstrong\u003eWarning\u003c\/strong\u003e:\u003c\/h3\u003e\n\u003cp\u003e1. You can use this CH4 filter to image the Sun, but you must use an energy rejection filter when doing so.  \u003c\/p\u003e\n\u003cp\u003e2. If an energy rejection filter is not used in conjunction with the Methane Filter then the heat can be sufficient to damage the telescope, the Methane Filter, and the imaging system.\u003c\/p\u003e\n\u003cp\u003e3.  This filter is NOT for visual use.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":67645058809969,"sku":null,"price":240.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/CH4125_63b8b272-7340-4aec-b9f3-69aa57ac1822.jpg?v=1791585569","url":"https:\/\/khanscope.com\/fr\/products\/antlia-ch4-methane-filter-1-25-ch4-125","provider":"Khan Scope Centre","version":"1.0","type":"link"}