{"product_id":"antlia-alp-t-dualband-5nm-ha-oiii-filter-2-alpt-db-5nm-haoiii-2","title":"Antlia ALP-T Dualband 5nm HA \u0026 OIII Filter - 2\" - ALPT-DB-5NM-HAOIII-2","description":"\u003cp\u003eThis ALP-T, or Anti-Light Pollution Filter, allows a 5nm 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\u003e\u003cem\u003eImportant!  Do not use this filter for solar viewing or imaging!\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia ALP-T Dualband 5nm 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 5nm 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\u003eThe Ha\/OIII dual-band Antlia filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from background light pollution.\u003c\/p\u003e\n\n\u003cp\u003eThe Antlia ALP-T dual band 5nm Ha \u0026amp; OIII filter is a dual line-pass filter designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. This dual-band filter can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on the Antlia ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII light from emission nebulae, with almost total suppression on unwanted wavelengths from light pollution, moonlight, and airglow with an optical density(OD) of 4.5. The result is that the Antlia ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003eFWHM:  5nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nHa CWL (Central Wavelength):  656.3nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nOIII CWL (Central Wavelength):  500.7nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nHa Peak Transmission:  92%\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nOIII Peak Transmission:  88%\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nBlocking:  OD4.5 @ 300-1100nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nFilter Thickness:  2mm +\/- 0.05mm\u003c\/li\u003e\u003c\/ul\u003e\n\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nExtremely steep bandpass edges minimize internal reflections\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nIdeal flat-top and moderate bandpass reducing spectrum down shifts\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nIon Gun Assisted Deposition coating technology on the double-sided polished substrate, making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nDesigned to suppress artificial light from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e2\" (M48*0.75) Filter Ring\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nBlack anodized finish on filter cell\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nEngraving on the filter cell is done with a laser for no fading\u003c\/li\u003e\u003c\/ul\u003e\n\n\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eThis filter cannot be used for solar imaging.  It is also not recommended that you employ this filter for visual observations.\u003cbr\u003e\u003cbr\u003e\n\nDO NOT LOOK AT THE SUN WITH THIS FILTER; IT WILL CAUSE SERIOUS EYE DAMAGE.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42037462270065,"sku":"ATL-ALPT-DB-5NM-HAOIII-2","price":347.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/ALP-T_Dual_5nm_HAOIII_2.jpg?v=1776459093","url":"https:\/\/khanscope.com\/en-fr\/products\/antlia-alp-t-dualband-5nm-ha-oiii-filter-2-alpt-db-5nm-haoiii-2","provider":"Khan Scope Centre","version":"1.0","type":"link"}