{"product_id":"astrodon-i-series-lrgb-filter-set-unmounted-49-7mm","title":"Astrodon I-Series LRGB Filter set unmounted 49.7mm","description":"\u003cp\u003e\u003cstrong\u003eI-Series\u003c\/strong\u003e filters are designed to approximately equalize the flux of \u003cstrong\u003e Interline \u003c\/strong\u003eCCD detectors (\u003cstrong\u003eformerly Kodak)\u003c\/strong\u003e, including compensation for the solar photon flux.  The \u003cstrong\u003eI-Series\u003c\/strong\u003e filters compensate for the lower red response of these Interline detectors affecting the design of the Green and Red filters.  The \u003cstrong\u003eLuminance \u003c\/strong\u003eand \u003cstrong\u003eBlue \u003c\/strong\u003efilters are the same as those in our \u003cstrong\u003eE-Series\u003c\/strong\u003e.  This means that your RGB color combine weights will be approximately 1:1:1 within perhaps 10% for equal length exposures.  This can never be perfect, but it does allow you to take one exposure time for all of your RGB data and therefore, only just one corresponding dark exposure time.  Again, this saves you precious imaging time and thus, simplifies your imaging.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSet includes Luminance (NIR\/UV-blocked colorless), Red, Green and Blue filters\u003c\/li\u003e\n\n\u003cli\u003e1.25\" mounted, 31, 49.7 mm dia.\u003c\/li\u003e\n\n\u003cli\u003e 3 +\/-0.025 mm single 1\/4 wave fused silica substrate before coating\u003c\/li\u003e\n\n\u003cli\u003e30 arcsec parallelism\u003c\/li\u003e\n\n\u003cli\u003e ~1:1:1 color combine weights for G2V white-point for Kodak Interline detectors\u003c\/li\u003e\n\n\u003cli\u003eEqual RGB exposures and one dark time\u003c\/li\u003e\n\n\u003cli\u003eBetter color separation (see spectra)\u003c\/li\u003e\n\n\u003cli\u003eBetter color rendition for galaxies based upon color theory\u003c\/li\u003e\n\n\u003cli\u003eSignificant reflection and star halo reduction\u003c\/li\u003e\n\n\u003cli\u003eSpectral \"gap\" between green and red filters to reduce the effects of light pollution\u003c\/li\u003e\n\n\u003cli\u003eHighest efficiency blue filter with less UV\u003c\/li\u003e\n\n\u003cli\u003eCorrect \"teal\" OIII color for planetary nebula (OIII signal \u0026gt;97% in blue and green)\u003c\/li\u003e\n\n\u003cli\u003eParfocal with \u003cstrong\u003eAstrodon\u003c\/strong\u003e's high-performance narrowband and near-IR Luminance filters\u003c\/li\u003e\n\n\u003cli\u003eUltra-hard and durable sputtered coatings coated to the edge of each filter\u003c\/li\u003e\n\n\u003cli\u003e\u003cstrong\u003eProudly made in the U.S.A.\u003c\/strong\u003e\u003c\/li\u003e\n\n\u003c\/ul\u003e","brand":"ASTRODON","offers":[{"title":"Default Title","offer_id":46718144938156,"sku":"LRGB2_I50R","price":1188.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0602\/8073\/3868\/files\/0dd89e4f-1c96-4f73-8d31-7de9854a6da0.webp?v=1783110741","url":"https:\/\/landseaskyco.com\/products\/astrodon-i-series-lrgb-filter-set-unmounted-49-7mm","provider":"Land Sea \u0026 Sky","version":"1.0","type":"link"}