{"id":7024,"date":"2025-04-22T16:47:49","date_gmt":"2025-04-22T14:47:49","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=7024"},"modified":"2026-03-29T17:53:35","modified_gmt":"2026-03-29T15:53:35","slug":"filtres-oiii-antlia-3nm-pro","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtres-oiii-antlia-3nm-pro\/","title":{"rendered":"Antlia 3nm Pro OIII filter"},"content":{"rendered":"<h3 style=\"text-align: center;\">Antlia 3nm Pro OIII filter<\/h3>\n<p>The Antlia OIII Pro narrow-band filter optimizes the width at half-maximum (FWHM) to 3nm. This narrow width enhances the contrast of emitting targets by reducing spurious background signal. It is designed to offer 88% transmission at 500.7nm wavelength, guaranteeing maximum signal and excellent definition of nebulous structures.<\/p>\n<p>Wider narrowband filters generally result in a significant loss of transmission due to center wavelength shifts (CWL). The 3nm Pro filter guarantees &gt;88% transmission in a \u00b11nm range around the center band, enabling compatibility with high-speed optics up to f\/3 without significant signal loss.<\/p>\n<p>Out-of-band rejection is rated at OD5 (0.001%), offering an excellent signal-to-noise ratio and effective cutting of spurious wavelengths. This filter is designed to minimize halos around bright stars, thanks to its sharp spectral profile.<\/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>One-piece substrate to avoid internal reflections<\/li>\n<li>Target objects: OIII nebulae, planetary nebulae, Wolf-Rayet, supernova remnants<\/li>\n<li>Suitable for polluted skies or dark sites<\/li>\n<li>Extends imaging time even with the Moon<\/li>\n<li>Compatible up to f\/3 without significant signal loss<\/li>\n<li>Blackened edges for unmounted filters to avoid internal reflections<\/li>\n<li>Optical reliability reduces post-processing retouching<\/li>\n<li>Specially designed for deep-sky objects containing OIII 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>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>500.7nm<\/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=\"size-full wp-image-7043 aligncenter\" src=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-OIII-3nm-Pro-Curve.png\" alt=\"\" width=\"1344\" height=\"769\" srcset=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-OIII-3nm-Pro-Curve.png 1344w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-OIII-3nm-Pro-Curve-300x172.png 300w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-OIII-3nm-Pro-Curve-1024x586.png 1024w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-OIII-3nm-Pro-Curve-768x439.png 768w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-OIII-3nm-Pro-Curve-18x10.png 18w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Antlia-OIII-3nm-Pro-Curve-600x343.png 600w\" sizes=\"(max-width: 1344px) 100vw, 1344px\" \/><\/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 for reduced 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 OIII Antlia 3nm Pro Le filtre Antlia OIII Pro \u00e0 bande \u00e9troite optimise la largeur \u00e0 mi-hauteur (FWHM) \u00e0 3nm. Cette faible largeur permet d\u2019augmenter le contraste des cibles \u00e0 \u00e9mission en r\u00e9duisant le signal parasite du fond de ciel. Il est con\u00e7u pour offrir une transmission de 88% \u00e0 la longueur d\u2019onde de [&hellip;]<\/p>\n","protected":false},"featured_media":7041,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[791],"product_cat":[780,833],"product_tag":[],"class_list":{"0":"post-7024","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-en-stock","10":"first","11":"instock","12":"sale","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\/7024","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=7024"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/7041"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=7024"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=7024"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=7024"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=7024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}