{"id":10995,"date":"2025-09-25T15:40:28","date_gmt":"2025-09-25T13:40:28","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&p=10995"},"modified":"2025-09-25T15:40:44","modified_gmt":"2025-09-25T13:40:44","slug":"ritchey-chretien-ts-optics-gso-8-rc-pro-carbone","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/ritchey-chretien-ts-optics-gso-8-rc-pro-carbone\/","title":{"rendered":"Ritchey-Chr\u00e9tien TS-Optics GSO 8\u2033 RC Pro Carbon"},"content":{"rendered":"

TS-Optics GSO 8\u2033 RC Pro Carbone 203\/1624 - Focused stability for astrophotography<\/h3>\n

The Ritchey-Chr\u00e9tien TS-Optics GSO 8\u2033\u00a0(203 mm, 1624 mm, f\/8)<\/strong> with carbon tube<\/strong> is the ideal instrument for demanding astrophotography: more stable focus in the face of thermal variations, rapid cooling thanks to the open tube, and fine stars in a field naturally corrected by the RC design (hyperbolic mirrors).<\/p>\n

Highlights<\/h3>\n
    \n
  • Genuine RC<\/strong> coma-free, relatively flat field, excellent sharpness across the entire sensor.<\/li>\n
  • Carbon tube<\/strong> almost zero expansion \u2192 very stable focus<\/strong> in long exposures.<\/li>\n
  • Quartz mirrors (fused silica)<\/strong> with 94 % reflectivity<\/strong> brighter, higher-contrast image.<\/li>\n
  • Open construction<\/strong> : bringing to temperature<\/em>\u00a0faster, less internal turbulence.<\/li>\n
  • Generous backfocus (\u2248159 mm at 2\u2033)<\/strong> Easily integrates corrector, gearbox, OAG and filter wheel.<\/li>\n
  • Focuser MONORAIL 2\u2033<\/strong> double speed: greater rigidity than a Crayford, 360\u00b0 rotation, graduation, motorization possible.<\/li>\n
  • Double dovetail<\/strong> Losmandy below, Vixen above \u2192 easy accessory mounting.<\/li>\n<\/ul>\n

    Astrophotography<\/h3>\n

    Without corrector, sensors up to APS-C<\/strong> are perfectly usable. For full format, a dedicated RC corrector is recommended. Visit CCD47 reducer 0.67\u00d7<\/strong> changes the focal length from approx. 1624 mm to \u22481088 mm and the aspect ratio from f\/8 to f\/5.36<\/strong>, reducing exposure times by more than 50 % and opening up framing for nebulae and diffuse galaxies.<\/p>\n

    Why a carbon tube?<\/h3>\n

    Mass changes only marginally (~300 g), but the increased firebox stability<\/strong> when temperature drops is determining: metal \u2192 contraction \u2192 frequent refocusing; carbon + quartz mirrors \u2192 refocusing. focus that hardly moves<\/strong>, essential for long imaging sessions and cool nights.<\/p>\n

    RC vs SCT\/Mak advantages<\/h3>\n
      \n
    • No Schmidt blade<\/strong> less fogging, better transmission (including near-IR).<\/li>\n
    • Path 100 % reflective<\/strong> no permanent glass \u2192 more photons to the sensor.<\/li>\n
    • No mirror shift<\/strong> Fixed primary, MAP via rigid external focuser.<\/li>\n<\/ul>\n

      Technical specifications<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
      Optical design<\/strong><\/td>\nRitchey-Chr\u00e9tien (hyperbolic mirrors)<\/td>\n<\/tr>\n
      Opening<\/strong><\/td>\n203 mm (8\u2033)<\/td>\n<\/tr>\n
      Focal length<\/strong><\/td>\n1624 mm<\/td>\n<\/tr>\n
      Ratio f\/<\/strong><\/td>\nf\/8 (\u2248 f\/5.36 with reducer 0.67\u00d7)<\/td>\n<\/tr>\n
      Theoretical resolution<\/strong><\/td>\n0,58\u2033<\/td>\n<\/tr>\n
      Mirrors<\/strong><\/td>\nQuartz (fused silica), reflectivity 94 %<\/td>\n<\/tr>\n
      Backfocus<\/strong><\/td>\n\u2248254 mm from the back of the tube or \u2248159 mm from the 2\u2033 runner<\/td>\n<\/tr>\n
      Tube diameter<\/strong><\/td>\n230 mm<\/td>\n<\/tr>\n
      Tube length<\/strong><\/td>\n580 mm (with focuser)<\/td>\n<\/tr>\n
      Weight<\/strong><\/td>\n\u22487.6 kg (with focuser and dovetails)<\/td>\n<\/tr>\n
      Tube material<\/strong><\/td>\nCarbon composite with internal baffles<\/td>\n<\/tr>\n
      Secondary obstruction<\/strong><\/td>\n85 mm<\/td>\n<\/tr>\n
      Focuser<\/strong><\/td>\nMONORAIL 2\u2033 double speed, 360\u00b0 rotation<\/td>\n<\/tr>\n
      Connection thread<\/strong><\/td>\nM90\u00d71 (tube side) + M69\u00d71 internal thread (focuser side)<\/td>\n<\/tr>\n
      Dovetails<\/strong><\/td>\n1\u00d7 Losmandy (bottom) + 1\u00d7 Vixen (top), ~395 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      In the box<\/h3>\n
        \n
      • RC 8\u2033 f\/8 carbon telescope<\/li>\n
      • MONORAIL 2\u2033 focuser (+ 1.25\u2033 adapter)<\/li>\n
      • Losmandy & Vixen dovetails<\/li>\n
      • M90 extension rings<\/li>\n
      • Protective cap<\/li>\n<\/ul>\n

        Aesthetic note<\/em> some photos show a black front ring; the version supplied has a red front ring.<\/p>\n

        In a nutshell<\/h3>\n

        Visit TS-Optics GSO 8\u2033 RC Carbon<\/strong> combines the precision of a true RC, the stability<\/strong>\u00a0of a carbon tube and simplicity of integration (long backfocus, double dovetail, rigid focuser). A premium choice for those who want sharp long exposures<\/strong> and an upgradeable setup (corrector, gearbox, OAG, filter wheel) without compromise.<\/p>","protected":false},"excerpt":{"rendered":"

        TS-Optics GSO 8″ RC Pro Carbone 203\/1624 \u2013 La stabilit\u00e9 focus au service de l\u2019astrophoto Le Ritchey-Chr\u00e9tien TS-Optics GSO 8″\u00a0(203 mm, 1624 mm, f\/8) avec tube carbone est l\u2019instrument id\u00e9al pour l\u2019astrophotographie exigeante : focus plus stable face aux variations thermiques, refroidissement rapide gr\u00e2ce au tube ouvert, et \u00e9toiles fines sur un champ naturellement corrig\u00e9 […]<\/p>\n","protected":false},"featured_media":10996,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[842],"product_cat":[750],"product_tag":[],"class_list":{"0":"post-10995","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-ts-optics","7":"product_cat-ritchey-chretien","9":"first","10":"on_supplier","11":"taxable","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/10995","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=10995"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/10996"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=10995"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=10995"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=10995"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=10995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}