{"product_id":"antlia-ch4-methane-filter-1-25","title":"Antlia CH4 Methane Filter - 1.25\"","description":"\u003c!-- more --\u003e\u003cp\u003eAntlia methane (CH4) filter is a specialized filter that allows light in the near infrared portion of the spectrum centered at 889nm to pass through with a bandpass that is 20nm wide. This filter was developed in order to measure finer details and more contrast of the methane that is characteristic of Jupiter, Mars, Saturn and other planets.\u003cbr\u003eThe human eye is not sensitive to light beyond about 700nm hence no person can see what is transmitted by this filter, so this filter is not suitable for visual applications.\u003c\/p\u003e\n\u003cp\u003eThe Methane (CH4) filter is recommended for planetary imaging such like Mars, Jupiter, Saturn and the other planets.\u003cbr\u003eIn order to produce good results, you are likely to require relatively longer exposures times and larger aperture telescope with this filter than with other filters.\u003c\/p\u003e\n\u003cp\u003eTechnical Data:\u003cbr\u003eoptical substrate\u003cbr\u003eThickness: 1.25” (2mm+\/-0.05mm)\u003cbr\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003cbr\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003cbr\u003e30 arcsec parallelism\u003cbr\u003eCenter-Wavelength of Antlia CH4 filter: 889nm\u003cbr\u003eTave＞90% , 90% transmission at 889nm\u003cbr\u003eOD5（0.001%）@ 200-1050nm\u003cbr\u003e2 sides Multi-layers anti-reflection coating\u003cbr\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n","brand":"Antlia","offers":[{"title":"Default Title","offer_id":50257849975069,"sku":"ANT-CH4","price":169.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ABUIABACGAAgsuPZ_AUovoD4vQIwoAY4oAY.jpg?v=1755106117","url":"https:\/\/davidastro.com\/fr-us\/products\/antlia-ch4-methane-filter-1-25","provider":"David Astro","version":"1.0","type":"link"}