{"id":18160,"date":"2026-09-28T17:49:52","date_gmt":"2026-09-28T15:49:52","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&p=18160"},"modified":"2026-11-14T11:34:29","modified_gmt":"2026-11-14T10:34:29","slug":"takahashi-tka18580","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/takahashi-tka18580\/","title":{"rendered":"Takahashi 76D RD: Focal Reducer for FC Telescopes"},"content":{"rendered":"

A gearbox designed specifically for the FC family<\/h3>\n

The Takahashi 76D RD is a focal reducer designed for certain FC-series refractors. This part number, TKA18580, refers to the 76D RD shown in the manufacturer\u2019s specifications, not to a kit that includes a telescope or a camera. It is of interest to photographers who are building an optical system around a compatible instrument and wish to incorporate a reducer suited to this series.<\/p>\n

Choose based on the instrument and its setup<\/h3>\n

The Takahashi data sheet specifically lists the FC-76DC, FC-76DS, FC-100DF, and FC-100DZ. It highlights the benefits of this reducer for instruments equipped with a compact focusing system, comparable to that of the FS-60CB. This comparison describes the mechanical system; it is not sufficient to add the FS-60CB to the list of compatible instruments. Before assembling the setup, check the diagram for your exact telescope model and the necessary adapter rings.<\/p>\n

Two threads and a specific pull force to follow<\/h3>\n

The input uses an M56x0.75 female thread; the output is M52x0.75 male. The specified mechanical backfocus is 56.2 mm. These specifications allow you to prepare the adapters and sensor spacing without confusing the thread diameter with the pipe diameter. Takahashi describes connecting a camera body using a wide-field T-ring for the FS-60, selected based on the camera brand. A CMOS or CCD camera can also be used, with or without a filter wheel, provided the required mounting and focal length are observed.<\/p>\n

Documented dimensions, without extrapolation<\/h3>\n

The body is 48 mm long and weighs 190 g. The manufacturer\u2019s specifications list a corrected image circle as \u00ab30 mm\/36 mm,\u00bb without specifying which value corresponds to a particular mount. It would therefore be misleading to promise the same field of view with all the eyepieces listed. Similarly, no single reduction factor or resulting focal length is specified in this data sheet: these values must be determined for the specific configuration chosen.<\/p>\n

Technical specifications<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
Features<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Reference<\/th>\nTKA18580<\/td>\n<\/tr>\n
Corrected image circle<\/th>\n30 mm\/36 mm (configuration not specified in the source)<\/td>\n<\/tr>\n
Mechanical Input Interface<\/th>\nM56x0.75 female thread<\/td>\n<\/tr>\n
Mechanical Output Interface<\/th>\nM52x0.75 male thread<\/td>\n<\/tr>\n
Mechanical backfocus<\/th>\n56.2 mm<\/td>\n<\/tr>\n
Length<\/th>\n48 mm<\/td>\n<\/tr>\n
Weight<\/th>\n190 g<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Reference Composition<\/h3>\n

76D RD reducer, part number TKA18580. The T-ring, housing, camera, and filter wheel mentioned here are examples of possible configurations; their inclusion is not specified in the manufacturer's data sheet.<\/p>\n

Manufacturer sources<\/h3>\n

Takahashi TKA18580 Official Specifications Sheet<\/a>.<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

Takahashi 76D RD TKA18580 reducer, with an M56x0.75 female input, an M52x0.75 male output, and a mechanical back focus of 56.2 mm.<\/p>","protected":false},"featured_media":18155,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[947],"product_cat":[650],"product_tag":[],"class_list":["post-18160","product","type-product","status-publish","has-post-thumbnail","product_brand-takahashi","product_cat-rducteurs-correcteurs-ap","first","on_supplier","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/18160","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=18160"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/18155"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=18160"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=18160"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=18160"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=18160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}