{"id":7010,"date":"2025-04-22T16:25:47","date_gmt":"2025-04-22T14:25:47","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=7010"},"modified":"2026-03-29T17:54:02","modified_gmt":"2026-03-29T15:54:02","slug":"filtres-h-alpha-antlia-3nm-pro","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtres-h-alpha-antlia-3nm-pro\/","title":{"rendered":"Antlia 3nm Pro H-alpha filter"},"content":{"rendered":"<h3 style=\"text-align: center;\">Antlia 3nm Pro H-alpha filter<\/h3>\n<p>Antlia's 3nm H-alpha Pro filter optimizes bandwidth to 3nm FWHM. This very narrow band enhances the contrast of emitting targets by reducing unwanted background signals. This filter guarantees 88% transmission at H-alpha wavelength (656.3nm), providing maximum signal and excellent definition of nebulous structures.<\/p>\n<p>Unlike wider filters, this filter strongly limits losses due to center wavelength shifts (CWL). It guarantees transmission greater than 88% within a range of \u00b11nm around the center band, enabling it to be used with both slow and fast lenses (up to f\/3) without significant signal loss.<\/p>\n<p>Out-of-band rejection is rated OD5 (0.001%), ensuring an excellent signal-to-noise ratio and effectively blocking interference. The sharp spectrum cut-off also reduces halos around bright stars.<\/p>\n<h3>Application and performance<\/h3>\n<ul>\n<li>High transmission and narrow bandwidth for maximum contrast<\/li>\n<li>Steep spectral profile to limit halos<\/li>\n<li>Unique substrate to eliminate internal reflections<\/li>\n<li>Target objects: H-alpha nebulae, planetary nebulae, Wolf-Rayet nebulae, supernova remnants<\/li>\n<li>Can be used on polluted sites or in dark skies<\/li>\n<li>Extends imaging time even with the Moon present<\/li>\n<li>Compatible up to f\/3 without significant signal loss<\/li>\n<li>Blackened edges to reduce glare on unmounted models<\/li>\n<li>Superior optical reliability to minimize post-photo processing<\/li>\n<li>Specially designed for deep-sky objects containing H-alpha<\/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>Substrate<\/td>\n<td>Optics, unglued monoblock<\/td>\n<\/tr>\n<tr>\n<td>Filter thickness<\/td>\n<td>2mm \u00b10.05mm (1.25\u2033, 2\u2033, 31mm, 36mm), 3mm \u00b10.05mm (50mm, 50x50mm)<\/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>656.3nm<\/td>\n<\/tr>\n<tr>\n<td>Maximum transmission<\/td>\n<td>&gt;88%<\/td>\n<\/tr>\n<tr>\n<td>Out-of-band discharge<\/td>\n<td>OD5 (0.001%) from 300 to 1000nm<\/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>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=\"alignnone size-full wp-image-7017\" src=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-H-alpha-3nm-Pro-Curve.png\" alt=\"\" width=\"1345\" height=\"768\" srcset=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-H-alpha-3nm-Pro-Curve.png 1345w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-H-alpha-3nm-Pro-Curve-300x171.png 300w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-H-alpha-3nm-Pro-Curve-1024x585.png 1024w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-H-alpha-3nm-Pro-Curve-768x439.png 768w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-H-alpha-3nm-Pro-Curve-18x10.png 18w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-H-alpha-3nm-Pro-Curve-600x343.png 600w\" sizes=\"(max-width: 1345px) 100vw, 1345px\" \/><\/div>\n<h3>Mounting ring<\/h3>\n<ul>\n<li>1.25'' (M28.5\u00d70.6), 2'' (M48x0.75)<\/li>\n<li>Ultra-fine cell to reduce vignetting<\/li>\n<li>Black anodized finish, unalterable laser engraving<\/li>\n<\/ul>\n<h3>Major nebula emission lines<\/h3>\n<ul>\n<li>H-\u03b1 : 656.3nm<\/li>\n<li>H-\u03b2 : 486.1nm<\/li>\n<li>OIII: 495.9nm and 500.7nm<\/li>\n<\/ul>\n<h3>Available sizes<\/h3>\n<ul>\n<li>Mounted: 1.25\u2033, 2\u2033<\/li>\n<li>Unmounted: \u00d831mm, \u00d836mm, \u00d850mm, square 50x50mm<\/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 AT THE SUN WITH THIS FILTER.<\/strong> Serious eye damage may occur.<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre H-alpha Antlia 3nm Pro Le filtre H-alpha Pro 3nm d\u2019Antlia optimise la bande passante \u00e0 3nm de largeur \u00e0 mi-hauteur (FWHM). Cette bande tr\u00e8s \u00e9troite permet d\u2019augmenter le contraste des cibles \u00e0 \u00e9mission en r\u00e9duisant les signaux parasites du fond de ciel. Ce filtre garantit une transmission de 88% \u00e0 la longueur d\u2019onde H-alpha [&hellip;]<\/p>\n","protected":false},"featured_media":7015,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[791],"product_cat":[780,801,833],"product_tag":[],"class_list":{"0":"post-7010","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-antlia","7":"product_cat-filtres-bande-etroite","8":"product_cat-filtre-astrophotographie-du-ciel-profond","9":"product_cat-en-stock","11":"first","12":"instock","13":"taxable","14":"shipping-taxable","15":"purchasable","16":"product-type-variable"},"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/7010","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=7010"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/7015"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=7010"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=7010"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=7010"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=7010"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}