{"product_id":"antila-alp-t-dualband-3nm-ha-oiii-filter-2-alpt-db-3nm-haoiii-2","title":"Antlia ALP-T Dualband 3nm HA \u0026 OIII Filter - 2\" - ALPT-DB-3NM-HAOIII-2","description":"\u003cp\u003eThis ALP-T, or Anti-Light Pollution Filter, allows a 3nm narrowband transmission from both the OIII and H-Alpha bands!  This model comes in a 2\" threaded filter cell, which allows it to be connected to the 2\" threaded accessory of your choice, including a 2\" filter wheel or filter holder. For f\/4 or slower telescopes.\u003c\/p\u003e\n\u003cp\u003eImportant!  Do not use this filter for solar viewing or imaging!\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia ALP-T Dualband 3nm H-Alpha \u0026amp; OIII Filter - 2\"\u003c\/h3\u003e\n\u003cp\u003eThis dual narrowband filter lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through, and is primarily engineered for color cameras when great SNR is desired when taking deep sky images. With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures and Application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and H-alpha 656.3nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band SII\/Hb filter to create images with better SNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength): Hydrogen-alpha: 656.3nm, Oxygen III: 500.7nm\u003c\/li\u003e\n\u003cli\u003ePeak Transmission: Hydrogen-alpha: 90%, Oxygen III: 82%\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing 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","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674720641137,"sku":"ATL-ALPT-DB-3NM-HAOIII-2","price":355.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/ALPT-DB-3NM-HA-OIII-2.jpg?v=1776459253","url":"https:\/\/khanscope.com\/fr-fr\/products\/antila-alp-t-dualband-3nm-ha-oiii-filter-2-alpt-db-3nm-haoiii-2","provider":"Khan Scope Centre","version":"1.0","type":"link"}