{"id":7054,"date":"2025-04-22T17:09:07","date_gmt":"2025-04-22T15:09:07","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=7054"},"modified":"2025-09-17T15:41:01","modified_gmt":"2025-09-17T13:41:01","slug":"filtre-nii-antlia-3nm-pro-2-copie","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtre-nii-antlia-3nm-pro-2-copie\/","title":{"rendered":"Antlia 3nm Pro - 2\u2033 NII filter"},"content":{"rendered":"<h3 style=\"text-align: center;\">Antlia NII 3nm Pro filter<\/h3>\n<h3>Interferential Filter for Astrophotography<\/h3>\n<p>The Antlia NII 3nm Pro filter optimizes the FWHM to a bandwidth of 3nm. By reducing this band, the filter significantly improves the contrast of emission targets by attenuating background signals. It is designed to achieve a transmission of 88% at 654.8nm, guaranteeing a strong signal and well-defined nebular structures.<\/p>\n<p>Out-of-band rejection is specified at OD5 (0.001%), ensuring an excellent signal-to-noise ratio (SNR) and effective cut-off of unwanted wavelengths. This filter is specially designed to minimize halos around bright stars, thanks to its clean spectral profile.<\/p>\n<h3>Key features and applications<\/h3>\n<ul>\n<li>High transmission and narrow bandwidth for maximum contrast<\/li>\n<li>Steep spectral profile reduces stellar halos<\/li>\n<li>One-piece, glueless optical substrate to prevent internal reflections<\/li>\n<li>Target: NII emission nebulae<\/li>\n<li>Can be used on polluted sites and in deep skies<\/li>\n<li>Extends imaging sessions even in the presence of the Moon<\/li>\n<li>Compatible with high-speed lenses up to f\/3 without significant loss of performance<\/li>\n<li>Unmounted filters are blackened at the edges to eliminate reflections.<\/li>\n<li>Excellent optical reliability, reducing post-processing corrections<\/li>\n<li>Designed specifically for NII-emitting celestial objects<\/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>NII 3nm Pro<\/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>654.8nm<\/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=\"alignnone size-full wp-image-7056\" src=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Spectrum-Curve-Antlia-NII-3nm-Pro-Filter.png\" alt=\"\" width=\"1345\" height=\"765\" srcset=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Spectrum-Curve-Antlia-NII-3nm-Pro-Filter.png 1345w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Spectrum-Curve-Antlia-NII-3nm-Pro-Filter-300x171.png 300w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Spectrum-Curve-Antlia-NII-3nm-Pro-Filter-1024x582.png 1024w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Spectrum-Curve-Antlia-NII-3nm-Pro-Filter-768x437.png 768w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Spectrum-Curve-Antlia-NII-3nm-Pro-Filter-18x10.png 18w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/Spectrum-Curve-Antlia-NII-3nm-Pro-Filter-600x341.png 600w\" sizes=\"(max-width: 1345px) 100vw, 1345px\" \/><\/div>\n<h3>Filter ring<\/h3>\n<ul>\n<li>2'' format (M48x0.75)<\/li>\n<li>Ultra-thin cell to minimize vignetting<\/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<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre Antlia NII 3nm Pro Filtre Interf\u00e9rentiel pour l&rsquo;Astrophotographie Le filtre Antlia NII 3nm Pro optimise la largeur \u00e0 mi-hauteur (FWHM) \u00e0 une bande passante de 3nm. En r\u00e9duisant cette bande, le filtre am\u00e9liore significativement le contraste des cibles \u00e0 \u00e9mission en att\u00e9nuant les signaux parasites du fond de ciel. Il est con\u00e7u pour atteindre [&hellip;]<\/p>\n","protected":false},"featured_media":7055,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[791],"product_cat":[780],"product_tag":[],"class_list":["post-7054","product","type-product","status-publish","has-post-thumbnail","product_brand-antlia","product_cat-filtres-bande-etroite","first","on_supplier","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/7054","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=7054"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/7055"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=7054"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=7054"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=7054"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=7054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}