{"id":7184,"date":"2025-04-26T15:12:01","date_gmt":"2025-04-26T13:12:01","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=7184"},"modified":"2026-05-20T14:56:24","modified_gmt":"2026-05-20T12:56:24","slug":"filtre-antlia-alp-t-dualband-3nm-ha-et-oiii","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtre-antlia-alp-t-dualband-3nm-ha-et-oiii\/","title":{"rendered":"Antlia ALP-T Dualband 3nm Ha and OIII filter"},"content":{"rendered":"<h3 style=\"text-align: center;\">Antlia ALP-T Dualband 3nm Ha&amp;OIII filter<\/h3>\n<p>The Antlia ALP-T Dualband 3nm Ha&amp;OIII filter is an ultra-narrow dual-band filter that transmits red H-alpha (656.3nm) and blue-green OIII (500.7nm) lines. Designed primarily for color cameras (OSC), it considerably improves the signal-to-noise ratio in deep-sky astrophotography, even under light pollution or moonlight.<\/p>\n<h3>Key features<\/h3>\n<ul>\n<li>Simultaneous transmission of H-alpha (656.3nm) and OIII (500.7nm) lines<\/li>\n<li>Ultra-narrow bandwidth of 3nm for each emission line<\/li>\n<li>OD4.5 suppression of unwanted wavelengths (300-1100nm)<\/li>\n<li>Designed for color cameras, but equally effective with monochrome cameras<\/li>\n<li>Special anti-reflective coating eliminates halos<\/li>\n<li>NIR blocking up to 1100nm<\/li>\n<li>Can be used with f\/4 aperture lenses and slower (prefer Highspeed version below f\/4)<\/li>\n<li>Enhanced durability through Ion Gun Assisted Deposition coating on double-sided polished substrate<\/li>\n<\/ul>\n<h3>Ideal applications<\/h3>\n<ul>\n<li>Imaging H-alpha and OIII emission nebulae<\/li>\n<li>Urban and rural photography<\/li>\n<li>Creation of false color palettes and enhanced SHO images<\/li>\n<li>Optimizing imaging time with OSC and monochrome cameras<\/li>\n<\/ul>\n<h3>Technical specifications<\/h3>\n<ul>\n<li>FWHM: 3nm (+0.6\/-0.1nm)<\/li>\n<li>Maximum transmission: 90% in H-alpha, 82% in OIII<\/li>\n<li>Out-of-band blocking: \u2265OD4.5 between 300nm and 1100nm<\/li>\n<li>Thickness: 2mm \u00b1 0.05mm<\/li>\n<li>Unglued single-piece optical substrate<\/li>\n<li>Surface quality: S\/D 60\/40 (MIL-O-13830)<\/li>\n<li>Transmitted wavefront: \u03bb\/4 or better<\/li>\n<li>Parallelism: &lt;30 arcsec<\/li>\n<li>Mounting: 2\u201d (M48x0.75), ultra-thin to minimize vignetting<\/li>\n<\/ul>\n<h3>Coating technology and reliability<\/h3>\n<ul>\n<li>Ion Gun technology for enhanced spectral stability<\/li>\n<li>Anti-halation coating to limit internal reflections<\/li>\n<li>Blackened edges to eliminate stray reflections<\/li>\n<li>Durable black anodized finish with laser engraving<\/li>\n<\/ul>\n<h3>Use in combination<\/h3>\n<p>Combined with the Antlia ALP-T Dualband 3.5nm SII&amp;Hb filter, it simultaneously captures the 4 main channels (Ha, OIII, SII, Hb), offering maximum post-processing flexibility for Hubble palettes and other artistic compositions.<\/p>\n<h3>Warnings<\/h3>\n<ul>\n<li>Not recommended for solar imaging<\/li>\n<li>Not recommended for night-time visual observation<\/li>\n<li><strong style=\"color: red;\">Never look directly at the sun with this filter: serious risk of eye damage.<\/strong><\/li>\n<\/ul>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre Antlia ALP-T Dualband 3nm Ha&amp;OIII Le filtre Antlia ALP-T Dualband 3nm Ha&amp;OIII est un filtre double bande ultra-\u00e9troit qui transmet les lignes rouges H-alpha (656.3nm) et bleu-vert OIII (500.7nm). Con\u00e7u principalement pour les cam\u00e9ras couleur (OSC), il permet d&rsquo;am\u00e9liorer consid\u00e9rablement le rapport signal\/bruit en astrophotographie du ciel profond, m\u00eame sous pollution lumineuse ou sous [&hellip;]<\/p>\n","protected":false},"featured_media":7187,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[791],"product_cat":[780,803,833],"product_tag":[],"class_list":["post-7184","product","type-product","status-publish","has-post-thumbnail","product_brand-antlia","product_cat-filtres-bande-etroite","product_cat-filtres-multi-bandes","product_cat-en-stock","first","on_supplier","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/7184","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=7184"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/7187"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=7184"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=7184"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=7184"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=7184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}