{"id":14465,"date":"2026-04-02T19:28:30","date_gmt":"2026-04-02T17:28:30","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&p=14465"},"modified":"2026-06-19T19:34:40","modified_gmt":"2026-06-19T17:34:40","slug":"kit-sho-antlia-3nm-pro-2-filtres-h-alpha-oiii-et-sii","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/kit-sho-antlia-3nm-pro-2-filtres-h-alpha-oiii-et-sii\/","title":{"rendered":"Kit SHO Antlia 3nm Pro 2\u2033 - H-alpha, OIII and SII filters"},"content":{"rendered":"

Kit SHO Antlia 3nm Pro - H-alpha, OIII and SII filters<\/h2>\n

The SHO Antlia 3nm Pro kit includes the three essential narrow-band filters for Hubble palette astrophotography (SHO): H-alpha (656.3nm)<\/strong>, OIII (500.7nm)<\/strong> and SII (672.4nm)<\/strong>. Each filter offers a half-value width (FWHM) of just 3nm, enabling precise isolation of nebula emission lines while effectively rejecting light pollution and spurious background signal.<\/p>\n

With transmission in excess of 88% on each channel and OD5-rated out-of-band rejection (0.001%), this kit is designed to produce high-contrast images, even in areas of light pollution or in the presence of the Moon. Compatibility with fast optics up to f\/3 makes it a versatile choice for all types of astrophotography setups.<\/p>\n

Why choose the SHO kit?<\/h3>\n

The SHO (Sulfur-Hydrogen-Oxygen) palette, made famous by the Hubble Space Telescope, reveals the complex structures of emission nebulae by assigning each channel to a distinct color. By combining the three filters in a SHO composite, the astrophotographer obtains images rich in detail and contrast, highlighting the different layers of ionized gas within deep-sky objects.<\/p>\n

Purchasing the complete kit guarantees perfect optical consistency between the three filters: same unglued monoblock substrate, same processing quality, same steep spectral profile. This simplifies image processing and ensures optimum homogeneity between channels.<\/p>\n

Filters included in kit<\/h3>\n\n\n\n\n\n\n\n
Filter<\/th>\nCenter wavelength (CWL)<\/th>\nFWHM<\/th>\nTransmission<\/th>\nMain targets<\/th>\n<\/tr>\n<\/thead>\n
H-alpha<\/strong><\/td>\n656.3nm<\/td>\n3nm<\/td>\n>88%<\/td>\nIonized hydrogen nebulae, HII regions<\/td>\n<\/tr>\n
OIII<\/strong><\/td>\n500.7nm<\/td>\n3nm<\/td>\n>88%<\/td>\nPlanetary nebulae, doubly ionized oxygen<\/td>\n<\/tr>\n
SII<\/strong><\/td>\n672.4nm<\/td>\n3nm<\/td>\n>88%<\/td>\nSupernova remnants, shock fronts, ionized sulfur<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Application and performance<\/h3>\n
    \n
  • Complete kit for Hubble palette imaging (SHO) with three perfectly matched filters<\/li>\n
  • High transmission (>88%) and ultra-narrow bandwidth (3nm) on each channel for maximum contrast<\/li>\n
  • Steep spectral profile on all three filters to reduce halos around bright stars<\/li>\n
  • One-piece, unglued substrate to eliminate internal reflections and guarantee durability<\/li>\n
  • Target objects: emission nebulae, planetary nebulae, Wolf-Rayet stars, supernova remnants<\/li>\n
  • Can be used in areas of light pollution or dark skies, even in the presence of the Moon<\/li>\n
  • Compatible with high-speed lenses up to f\/3 without significant signal loss<\/li>\n
  • Blackened edges on unmounted models to limit stray reflections<\/li>\n
  • Superior optical reliability reduces post-processing corrections<\/li>\n
  • Designed exclusively for astrophotography of deep-sky objects<\/li>\n<\/ul>\n

    Common technical features<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
    Substrate<\/td>\nOptics, unglued monoblock<\/td>\n<\/tr>\n
    Thickness<\/td>\n2mm \u00b10.05mm (1.25\u2033, 2\u2033, 31mm, 36mm), 3mm \u00b10.05mm (50mm, 50x50mm)<\/td>\n<\/tr>\n
    FWHM<\/td>\n3nm (on each filter)<\/td>\n<\/tr>\n
    Maximum transmission<\/td>\n>88% (on each filter)<\/td>\n<\/tr>\n
    Out-of-band discharge<\/td>\nOD5 (0.001%) from 300 to 1000nm<\/td>\n<\/tr>\n
    Surface quality<\/td>\nS\/D 60\/40 (MIL-O-13830 standard)<\/td>\n<\/tr>\n
    Transmitted wavefront<\/td>\n\u03bb\/4 or better<\/td>\n<\/tr>\n
    Parallelism<\/td>\n< 30 arcsec<\/td>\n<\/tr>\n
    Warranty<\/td>\n3 years against delamination<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Spectral curves<\/h3>\n
    \"Courbe<\/div>\n
    \"Courbe<\/div>\n
    \"Courbe<\/div>\n

    Mounting ring<\/h3>\n
      \n
    • 1.25 \u00bb (M28.5\u00d70.6), 2 \u00bb (M48x0.75)<\/li>\n
    • Ultra-fine cell for reduced vignetting<\/li>\n
    • Black anodized finish, unalterable laser engraving<\/li>\n<\/ul>\n

      Emission rays covered by SHO kit<\/h3>\n
        \n
      • H-\u03b1: 656.3nm (hydrogen)<\/li>\n
      • OIII: 500.7nm (doubly ionized oxygen)<\/li>\n
      • SII: 672.4nm (ionized sulfur)<\/li>\n<\/ul>\n

        Available sizes<\/h3>\n
          \n
        • Mounted: 1.25\u2033, 2\u2033<\/li>\n
        • Unmounted: \u00d831mm, \u00d836mm, \u00d850mm, square 50x50mm<\/li>\n<\/ul>\n

          Not recommended for :<\/h3>\n
            \n
          • Solar observation<\/li>\n
          • Visual observation at night<\/li>\n<\/ul>\n

            Warning:<\/h3>\n

            NEVER LOOK AT THE SUN WITH THESE FILTERS.<\/strong> Serious eye damage may occur.<\/p>","protected":false},"excerpt":{"rendered":"

            Kit SHO Antlia 3nm Pro \u2013 Filtres H-alpha, OIII et SII Le kit SHO Antlia 3nm Pro regroupe les trois filtres \u00e0 bande \u00e9troite essentiels pour l’astrophotographie en palette Hubble (SHO) : H-alpha (656.3nm), OIII (500.7nm) et SII (672.4nm). Chaque filtre offre une largeur \u00e0 mi-hauteur (FWHM) de seulement 3nm, permettant d’isoler avec pr\u00e9cision les […]<\/p>\n","protected":false},"featured_media":14466,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[791],"product_cat":[833,780,801],"product_tag":[856],"class_list":["post-14465","product","type-product","status-publish","has-post-thumbnail","product_brand-antlia","product_cat-en-stock","product_cat-filtres-bande-etroite","product_cat-filtre-astrophotographie-du-ciel-profond","product_tag-produits-phares-en-stock","first","onbackorder","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/14465","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=14465"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/14466"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=14465"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=14465"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=14465"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=14465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}