{"id":7051,"date":"2025-04-22T17:04:01","date_gmt":"2025-04-22T15:04:01","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=7051"},"modified":"2025-09-17T15:41:01","modified_gmt":"2025-09-17T13:41:01","slug":"filtre-h-beta-3nm-pro-2","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtre-h-beta-3nm-pro-2\/","title":{"rendered":"H-Beta Antlia 3nm Pro - 2\u2033 filter"},"content":{"rendered":"<h3 style=\"text-align: center;\">Antlia H-Beta 3nm Pro filter<\/h3>\n<h3>Interferential Filter for Astrophotography<\/h3>\n<p>The Antlia H-Beta 3nm Pro filter optimizes the width at half maximum (FWHM) to a bandwidth of 3nm. Thanks to this narrow bandwidth, the filter greatly improves the contrast of emission targets by reducing unwanted background noise. It achieves an impressive transmission of 88% at 486.1nm, guaranteeing a powerful signal and well-defined nebular structures.<\/p>\n<p>Out-of-band blocking is rated OD5 (0.001%), ensuring an excellent signal-to-noise ratio (SNR) and effectively cutting interference from other wavelengths. Its clean spectral profile is designed to minimize halos around bright stars.<\/p>\n<h3>Antlia's Pro 3nm series<\/h3>\n<p>The series includes Ha, SII, OIII and H-Beta filters, which capture extremely narrow data on four channels, offering great flexibility of combination in post-processing to meet a variety of needs.<\/p>\n<h3>Key features and applications<\/h3>\n<ul>\n<li>High transmission and minimal bandwidth for maximum contrast<\/li>\n<li>Steep spectral profile to limit halos around bright stars<\/li>\n<li>One-piece substrate to eliminate internal reflections<\/li>\n<li>Target: H-Beta emission nebulae<\/li>\n<li>Can be used in polluted areas or in dark skies<\/li>\n<li>Compatible up to f\/3 with minimal signal loss<\/li>\n<li>Blackened edges on unmounted filters to eliminate glare<\/li>\n<li>High optical reliability reduces subsequent image processing<\/li>\n<li>Filter effective only for deep-sky objects containing H-Beta emissions<\/li>\n<\/ul>\n<h3>Technical specifications<\/h3>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Type<\/td>\n<td>H-Beta<\/td>\n<\/tr>\n<tr>\n<td>FWHM<\/td>\n<td>3nm<\/td>\n<\/tr>\n<tr>\n<td>Center wavelength (CWL)<\/td>\n<td>486.1nm<\/td>\n<\/tr>\n<tr>\n<td>Maximum transmission<\/td>\n<td>88%<\/td>\n<\/tr>\n<tr>\n<td>Out-of-band discharge<\/td>\n<td>&gt;OD5 (0.001%) from 300 to 1100nm<\/td>\n<\/tr>\n<tr>\n<td>Thickness<\/td>\n<td>2mm \u00b10.05mm<\/td>\n<\/tr>\n<tr>\n<td>Substrate<\/td>\n<td>Optics, unglued monoblock<\/td>\n<\/tr>\n<tr>\n<td>Surface quality<\/td>\n<td>S\/D 60\/40 (MIL-O-13830 standard)<\/td>\n<\/tr>\n<tr>\n<td>Transmitted wavefront<\/td>\n<td>\u03bb\/4 or better<\/td>\n<\/tr>\n<tr>\n<td>Parallelism<\/td>\n<td>&lt; 30 arcsec<\/td>\n<\/tr>\n<tr>\n<td>Ring<\/td>\n<td>2'' (M48x0.75)<\/td>\n<\/tr>\n<tr>\n<td>Warranty<\/td>\n<td>3 years against delamination<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Spectral curve<\/h3>\n<div class=\"image-placeholder\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-7053 aligncenter\" src=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-Hb-3nm-spectrum-curve.jpg\" alt=\"\" width=\"1344\" height=\"763\" srcset=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-Hb-3nm-spectrum-curve.jpg 1344w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-Hb-3nm-spectrum-curve-300x170.jpg 300w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-Hb-3nm-spectrum-curve-1024x581.jpg 1024w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-Hb-3nm-spectrum-curve-768x436.jpg 768w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-Hb-3nm-spectrum-curve-18x10.jpg 18w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-Hb-3nm-spectrum-curve-600x341.jpg 600w\" sizes=\"(max-width: 1344px) 100vw, 1344px\" \/><\/div>\n<h3>Filter ring<\/h3>\n<ul>\n<li>2'' format (M48x0.75)<\/li>\n<li>Ultra-thin cell to minimize vignetting and maximize usable aperture<\/li>\n<li>Black anodized finish<\/li>\n<li>Tamper-proof laser engraving<\/li>\n<\/ul>\n<h3>Not recommended for :<\/h3>\n<ul>\n<li>Solar observation<\/li>\n<li>Visual observation at night<\/li>\n<\/ul>\n<h3>Warning:<\/h3>\n<p style=\"color: red;\"><strong>NEVER LOOK DIRECTLY AT THE SUN WITH THIS FILTER.<\/strong> Serious eye damage may occur.<\/p>\n<h3>Dualband filters for OSC cameras<\/h3>\n<p>Antlia also offers dual-band filters for color cameras (OSC): the <strong>ALP-T Dualband Ha&amp;OIII 3nm<\/strong> and the <strong>SII&amp;Hb 3.5nm<\/strong>. Their synergy produces extremely detailed images on all four channels: Ha, OIII, SII and Hb. These spectra can be recombined in classic or creative color palettes: H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre Antlia H-Beta 3nm Pro Filtre Interf\u00e9rentiel pour l&rsquo;Astrophotographie Le filtre Antlia H-Beta 3nm Pro optimise la largeur \u00e0 mi-hauteur (FWHM) \u00e0 une bande passante de 3nm. Gr\u00e2ce \u00e0 cette \u00e9troite bande, le filtre am\u00e9liore fortement le contraste des cibles \u00e0 \u00e9mission en r\u00e9duisant le bruit de fond non d\u00e9sir\u00e9. Il atteint une transmission impressionnante [&hellip;]<\/p>\n","protected":false},"featured_media":7052,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[791],"product_cat":[780],"product_tag":[],"class_list":{"0":"post-7051","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-antlia","7":"product_cat-filtres-bande-etroite","9":"first","10":"on_supplier","11":"taxable","12":"shipping-taxable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/7051","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/comments?post=7051"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/7052"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=7051"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=7051"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=7051"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=7051"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}