{"id":14977,"date":"2026-05-08T17:03:14","date_gmt":"2026-05-08T15:03:14","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&p=14977"},"modified":"2026-05-08T17:03:31","modified_gmt":"2026-05-08T15:03:31","slug":"askar-111f-0-74x-reducer","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/askar-111f-0-74x-reducer\/","title":{"rendered":"Askar 111F 0.74\u00d7 Reducer"},"content":{"rendered":"

Askar 111F 0.74\u00d7 Reducer - Full Frame Reducer for Askar 111F<\/h2>\n

Visit Askar 111F 0.74\u00d7 Reducer<\/strong> is a focal reducer specially optimized for telescopes. Askar 111F Flat-Field<\/strong>. This accessory transforms the astrograph into a faster, more versatile system, perfectly suited to wide-field deep-sky astrophotography.<\/p>\n

Thanks to its 0.74\u00d7<\/strong>, the telescope from f\/6.9 to f\/5.1<\/strong>, This is achieved by integrating advanced field correction to obtain fine, homogeneous stars even in the corners of Full Frame sensors.<\/p>\n

The gain in luminosity and photographic field of view significantly reduces exposure times, while facilitating the imaging of extended deep-sky objects.<\/p>\n

Turn your Askar 111F into a fast f\/5.1 astrograph<\/h3>\n

Once installed on the Askar 111F, the reducer reduces the native focal length:<\/p>\n

    \n
  • From 766 mm to 566 mm<\/li>\n
  • From f\/6.9 to f\/5.1<\/li>\n<\/ul>\n

    This transformation brings several major benefits:<\/p>\n

      \n
    • Shorter exposure times<\/li>\n
    • A wider field of photography<\/li>\n
    • Improved light collection<\/li>\n
    • Better efficiency under imperfect skies<\/li>\n
    • More comfortable imaging of large deep-sky objects<\/li>\n<\/ul>\n

      The reducer is particularly useful for photography:<\/p>\n

        \n
      • The great nebulae<\/li>\n
      • HII complexes<\/li>\n
      • Open clusters<\/li>\n
      • The rich regions of the Milky Way<\/li>\n
      • Weak objects requiring a lot of signal<\/li>\n<\/ul>\n

        Full Frame integrated field correction<\/h3>\n

        The Askar 111F 0.74\u00d7 Reducer doesn't just shorten the focal length. It also incorporates advanced field correction to effectively eliminate field curvature.<\/p>\n

        This correction guarantees :<\/p>\n

          \n
        • Fine stars in the center<\/li>\n
        • Excellent field homogeneity<\/li>\n
        • Excellent correction right down to the corners<\/li>\n
        • Native compatibility with Full Frame sensors<\/li>\n<\/ul>\n

          The supported image circle reaches 44 mm<\/strong>, perfectly suited to modern 24\u00d736 sensors.<\/p>\n

          High-performance triplet optical design<\/h3>\n

          The reducer is based on an optical formula with three lenses<\/strong> specially designed to work with Askar 111F.<\/p>\n

          This design ensures :<\/p>\n

            \n
          • Excellent optical correction<\/li>\n
          • Uniform field reduction<\/li>\n
          • Excellent aberration control<\/li>\n
          • Optimum compatibility with modern sensors<\/li>\n<\/ul>\n

            The whole system has been designed to preserve the scope's native image quality while increasing its photographic speed.<\/p>\n

            Standard backfocus 55 mm<\/h3>\n

            The Askar 111F 0.74\u00d7 Reducer adopts a standard backfocus of 55 mm<\/strong> measured from M48 male thread.<\/p>\n

            This standard distance facilitates integration with most modern astrophotographic equipment:<\/p>\n

              \n
            • Astronomical CMOS cameras<\/li>\n
            • DSLR<\/li>\n
            • Hybrid cameras<\/li>\n
            • Filter wheels<\/li>\n
            • Tilt plates<\/li>\n
            • Standard imaging accessories<\/li>\n<\/ul>\n

              The 111F photographic extension tube includes :<\/p>\n

                \n
              • M54x0.75 adapter<\/li>\n
              • M48x0.75 adapter<\/li>\n<\/ul>\n

                This makes installation particularly quick and easy.<\/p>\n

                2-inch filter compatibility<\/h3>\n

                The reducer's rear adapter incorporates a standard thread M48x0.75<\/strong> for direct mounting of 2\" astronomical filters.<\/p>\n

                This compatibility facilitates the use of :<\/p>\n

                  \n
                • Duoband filters<\/li>\n
                • Narrowband filters<\/li>\n
                • Anti-light pollution filters<\/li>\n
                • LRGB filters<\/li>\n
                • UV\/IR Cut filters<\/li>\n<\/ul>\n

                  Premium CNC manufacturing<\/h3>\n

                  Like other Askar high-end accessories, the 111F 0.74\u00d7 Reducer benefits from precision CNC manufacturing ensuring :<\/p>\n

                    \n
                  • Excellent mechanical rigidity<\/li>\n
                  • Precise optical alignment<\/li>\n
                  • Excellent durability<\/li>\n
                  • Reliable mechanical integration<\/li>\n<\/ul>\n

                    The gearbox is supplied with front and rear threaded metal plugs to protect the optical surfaces from dust and moisture during storage.<\/p>\n

                    Optimized mechanical compatibility<\/h3>\n

                    The gearbox uses M68x1<\/strong> on both sides to ensure :<\/p>\n

                      \n
                    • Excellent mechanical stability<\/li>\n
                    • A robust connection<\/li>\n
                    • Limited bending<\/li>\n
                    • Optimum optical alignment<\/li>\n<\/ul>\n

                      This approach is particularly important for modern Full Frame setups requiring excellent mechanical precision.<\/p>\n

                      Summary table of technical specifications<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                      Features<\/th>\nValue<\/th>\n<\/tr>\n
                      Compatibility<\/td>\nAskar 111F Flat-Field<\/td>\n<\/tr>\n
                      Reduction factor<\/td>\n0.74\u00d7<\/td>\n<\/tr>\n
                      Resulting focus<\/td>\n566 mm<\/td>\n<\/tr>\n
                      Resulting focal ratio<\/td>\nf\/5.1<\/td>\n<\/tr>\n
                      Optical type<\/td>\nTriplet corrector\/reducer<\/td>\n<\/tr>\n
                      Image circle<\/td>\n44 mm Full Frame<\/td>\n<\/tr>\n
                      Backfocus<\/td>\n55 mm from M48 male thread<\/td>\n<\/tr>\n
                      Main thread<\/td>\nM68x1<\/td>\n<\/tr>\n
                      Adapters included<\/td>\nM54x0.75 and M48x0.75<\/td>\n<\/tr>\n
                      Filter compatibility<\/td>\nIntegrated 2\u2033 M48 filter thread<\/td>\n<\/tr>\n
                      Weight<\/td>\n0.5 kg<\/td>\n<\/tr>\n
                      Manufacturing<\/td>\nHigh-precision CNC aluminum<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      Why choose Askar 111F 0.74\u00d7 Reducer?<\/h3>\n

                      The Askar 111F 0.74\u00d7 Reducer is an excellent complement for astrophotographers wishing to exploit the full potential of their Askar 111F.<\/p>\n

                      By transforming the refractor into a fast astrograph at f\/5.1 while retaining excellent Full Frame correction, this reducer significantly improves the instrument's photographic efficiency and versatility.<\/p>\n

                      Its advanced optical design, robust mechanics and perfectly optimized compatibility with the 111F make it a particularly coherent accessory for demanding deep-sky enthusiasts.<\/p>","protected":false},"excerpt":{"rendered":"

                      Askar 111F 0.74\u00d7 Reducer \u2013 R\u00e9ducteur Correcteur Full Frame pour Askar 111F Le Askar 111F 0.74\u00d7 Reducer est un r\u00e9ducteur de focale sp\u00e9cialement optimis\u00e9 pour la lunette Askar 111F Flat-Field. Cet accessoire transforme l\u2019astrographe en un syst\u00e8me plus rapide et plus polyvalent, parfaitement adapt\u00e9 \u00e0 l\u2019astrophotographie du ciel profond grand champ. Gr\u00e2ce \u00e0 son facteur […]<\/p>\n","protected":false},"featured_media":14978,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[382],"product_cat":[650],"product_tag":[],"class_list":{"0":"post-14977","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-askar","7":"product_cat-rducteurs-correcteurs-ap","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\/14977","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=14977"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/14978"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=14977"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=14977"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=14977"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=14977"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}