{"id":18073,"date":"2026-09-28T12:26:08","date_gmt":"2026-09-28T10:26:08","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&p=18073"},"modified":"2026-11-14T11:46:28","modified_gmt":"2026-11-14T10:46:28","slug":"takahashi-tka31587s","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/takahashi-tka31587s\/","title":{"rendered":"Takahashi TKA31587S: TOA-645 correction kit for TOA-130"},"content":{"rendered":"

Correcting the Field of View in Large-Format Imaging<\/h3>\n

The TOA-645 TKA31587S kit is designed for imaging with the TOA-130 telescope. The manufacturer specifies a corrected image circle of 60 mm. Field correction helps address the field curvature of TOA telescopes; however, it does not eliminate the need to follow the specified mounting and spacing guidelines.<\/p>\n

Distinguish between the two distances to the sensor<\/h3>\n

For the TOA-130, the manufacturer specifies a mechanical distance of 83.7 mm from the M72 output of the corrector, and 56.2 mm from the M54 output of the CA35. These distances use different reference planes: do not add them together. The table also specifies the focal length and F\/D ratio achieved with this telescope.<\/p>\n

Select the configuration that matches the scope<\/h3>\n

The manufacturer's documentation specifies the M72 No. 51L extension ring for use with the TOA-130. The CA Ring35 extension ring provides an M54 mount. The optical corrector is common to all TOA kits, but the extension rings must not be interchanged without first verifying the mounting of the instrument in question.<\/p>\n

Technical specifications<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Features<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Resulting Focal Length (TOA-130)<\/th>\n990 mm<\/td>\n<\/tr>\n
Resulting F\/D ratio (TOA-130)<\/th>\n7,6<\/td>\n<\/tr>\n
Corrected Image Circle Diameter<\/th>\n60 mm<\/td>\n<\/tr>\n
MBD mechanical backfocus from the corrector (M72 output)<\/th>\n83.7 mm<\/td>\n<\/tr>\n
MBD mechanical backfocus starting with the CA35 (M54 mount)<\/th>\n56.2 mm<\/td>\n<\/tr>\n
Mechanical output interface (corrector)<\/th>\nM72x1 female thread<\/td>\n<\/tr>\n
Mechanical output interface (CA35)<\/th>\nM54x0.75 female thread<\/td>\n<\/tr>\n
Mechanical diameter<\/th>\n78 mm<\/td>\n<\/tr>\n
Mechanical length (fully assembled)<\/th>\n70 mm<\/td>\n<\/tr>\n
Weight (fully assembled)<\/th>\n360 g<\/td>\n<\/tr>\n
Reference<\/th>\nTKA31587S<\/td>\n<\/tr>\n
Extension ring provided by the manufacturer<\/th>\n51L<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

Takahashi TOA-645 Field Corrector Kit for the TOA-130, with a 60 mm corrected image circle and a back focus of 56.2 mm from the CA35 exit port.<\/p>","protected":false},"featured_media":18069,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[947],"product_cat":[650],"product_tag":[],"class_list":["post-18073","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\/18073","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=18073"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/18069"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=18073"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=18073"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=18073"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=18073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}