{"id":7189,"date":"2025-04-26T15:15:24","date_gmt":"2025-04-26T13:15:24","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=7189"},"modified":"2025-09-17T15:41:17","modified_gmt":"2025-09-17T13:41:17","slug":"filtre-antlia-alp-t-dualband-3-5nm-sii-et-hb","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtre-antlia-alp-t-dualband-3-5nm-sii-et-hb\/","title":{"rendered":"Antlia ALP-T Dualband 3.5nm SII and Hb filter"},"content":{"rendered":"<h3 style=\"text-align: center;\">Antlia ALP-T Dualband 3.5nm SII&amp;H\u03b2 filter<\/h3>\n<p>The Antlia ALP-T Dualband 3.5nm SII&amp;H\u03b2 filter is specially designed to simultaneously capture Sulfur-II (672.4nm) and Hydrogen-Beta (486.1nm) emissions. It significantly enhances nebula contrast and delivers a superior signal-to-noise ratio (SNR), even under light pollution or moonlight. It is optimized for color cameras (OSC), but works equally well with monochrome sensors.<\/p>\n<h3>Key features<\/h3>\n<ul>\n<li>Simultaneous transmission of SII (672.4nm) and H-Beta (486.1nm) lines<\/li>\n<li>Ultra-narrow bandwidth of 3.5nm for each emission line<\/li>\n<li>OD4.5 suppression of interfering wavelengths between 300nm and 1100nm<\/li>\n<li>Designed for color cameras, compatible with monochrome sensors<\/li>\n<li>Advanced anti-reflective coating eliminates halos and internal reflections<\/li>\n<li>Effective NIR blocking<\/li>\n<li>Recommended for use with f\/4 or slower lenses (prefer Highspeed version for f\/&lt;4)<\/li>\n<\/ul>\n<h3>Ideal applications<\/h3>\n<ul>\n<li>Imaging nebulae with a false-color palette (H-O-H\u03b2, S-H-O, H-S-OHb, etc.).<\/li>\n<li>Capture spectroscopic details invisible in conventional RGB<\/li>\n<li>Improved structure separation in SHO astrophotography<\/li>\n<li>Use under urban, suburban or rural skies (Bortle 1 to 8)<\/li>\n<\/ul>\n<h3>Technical specifications<\/h3>\n<ul>\n<li>FWHM: 3.5nm +0.5\/-0.5nm<\/li>\n<li>Central wavelength (CWL): SII 672.4nm \/ H\u03b2 486.1nm<\/li>\n<li>Maximum transmission: 90% in SII, 85% in H\u03b2<\/li>\n<li>Out-of-band blocking: \u2265OD4.5 from 300nm to 1100nm<\/li>\n<li>Filter thickness: 2mm \u00b1 0.05mm<\/li>\n<li>Substrate: Unglued single-piece optical glass<\/li>\n<li>Optical surface: S\/D 60\/40 (MIL-O-13830 standard)<\/li>\n<li>Transmitted wavefront: \u03bb\/4 or better<\/li>\n<li>Parallelism: &lt;30 arcsec<\/li>\n<li>Mounting: 2\u2033 (M48x0.75), ultra-thin to reduce vignetting<\/li>\n<\/ul>\n<h3>Technology and manufacturing<\/h3>\n<ul>\n<li>Multi-layer Ion Gun Assisted Deposition coating for maximum stability<\/li>\n<li>Eliminate halos and reduce internal reflections<\/li>\n<li>Blackened edges to eliminate stray reflections<\/li>\n<li>Durable black anodized finish and tamper-proof laser engraving<\/li>\n<li>Exceptional durability thanks to advanced Antlia coating technology<\/li>\n<\/ul>\n<h3>Advantages of SII&amp;H\u03b2 capture over SII&amp;OIII<\/h3>\n<p>The choice of an SII&amp;H\u03b2 pass instead of SII&amp;OIII is based on the importance of H\u03b2 in astrophotography: although OIII is often over-represented via RGGB arrays, H\u03b2 reveals unique structures invisible with H\u03b1, SII and OIII alone. This enriches false color palettes and improves the separation of subtle details in nebulae with a strong blue component.<\/p>\n<h3>Directions for use<\/h3>\n<ul>\n<li>Perfect for combining with Antlia ALP-T Dualband 3nm Ha&amp;OIII filter<\/li>\n<li>Captures all 4 spectral channels Ha, OIII, SII, Hb for ultra-rich processing<\/li>\n<li>Ideal for saving capture time with color sensors while achieving near-monochrome detail<\/li>\n<\/ul>\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, as serious eye damage could result.<\/strong><\/li>\n<\/ul>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre Antlia ALP-T Dualband 3.5nm SII&amp;H\u03b2 Le filtre Antlia ALP-T Dualband 3.5nm SII&amp;H\u03b2 est sp\u00e9cialement con\u00e7u pour capter simultan\u00e9ment les \u00e9missions du Soufre-II (672.4nm) et de l\u2019Hydrog\u00e8ne-B\u00eata (486.1nm). Il permet d&rsquo;am\u00e9liorer consid\u00e9rablement le contraste des n\u00e9buleuses et d\u2019obtenir un rapport signal\/bruit (SNR) sup\u00e9rieur, m\u00eame sous la pollution lumineuse ou la lumi\u00e8re de la Lune. Il [&hellip;]<\/p>\n","protected":false},"featured_media":7190,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[791],"product_cat":[780,803],"product_tag":[],"class_list":["post-7189","product","type-product","status-publish","has-post-thumbnail","product_brand-antlia","product_cat-filtres-bande-etroite","product_cat-filtres-multi-bandes","first","on_supplier","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/7189","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=7189"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/7190"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=7189"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=7189"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=7189"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=7189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}