{"id":112889,"date":"2026-10-09T16:52:43","date_gmt":"2026-10-09T14:52:43","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=112889"},"modified":"2026-10-09T20:31:57","modified_gmt":"2026-10-09T18:31:57","slug":"adjustment-screws-for-the-viewfinder-of-a-12-inch-sct-f-10-3-or-4-screws-bobs-knobs","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-een-12-inch-sct-f-10-3-of-4-schroeven-bobs-knobs\/","title":{"rendered":"Adjusting screws for the viewfinder of a 12 inch SCT f\/10, 3 or 4 screws | Bob\u2019s Knobs"},"content":{"rendered":"

With a large tube, the front isn\u2019t always easy to reach, and you don\u2019t want to have to use a small screwdriver to get to it. With these adjustment screws for a 12-inch SCT from Bob\u2019s Knobs, you twist the collimation screws on the secondary holder with your fingers.<\/p>\n\n\n\n

The set fits on 12 inches Schmidt-Cassegrain telescopes<\/a> with f\/10, the secondary holder has three or four screws. Before ordering, check how your holder looks like.<\/p>\n\n\n\n

Replace the screws one by one so that the mirror stays in place, and then adjust the collimation to a bright star. If there is a clear night, you can also work with a artificial star for collimation<\/a>.<\/p>\n\n\n\n

On a humid evening, a rainbow band for 12 inch telescopes<\/a> the corrector plate free of dew.<\/p>","protected":false},"excerpt":{"rendered":"

Bob\u2019s Knobs for the secondary holder of a 12 inch SCT f\/10 with three or four screws. Collimate by hand.<\/p>","protected":false},"featured_media":112888,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1559],"product_cat":[56,3091],"product_tag":[],"class_list":["post-112889","product","type-product","status-publish","has-post-thumbnail","product_brand-bobs-knobs","product_cat-telescoop-accessoires","product_cat-telescoop-onderdelen","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"bundled_by":[],"bundle_stock_status":"instock","bundle_stock_quantity":null,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":112881,"url":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-een-8-inch-sct-f-10-6-schroeven-bobs-knobs\/","url_meta":{"origin":112889,"position":0},"title":"Adjusting screws for the viewfinder of an 8 inch SCT f\/10, 6 screws | Bob\u2019s Knobs","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Bob's Knobs for 8 inch Schmidt-Cassegrains f\/10 with six screws on the secondary holder. This way you can line up without a screwdriver.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58067_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58067_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58067_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":112883,"url":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-een-10-inch-sct-f-10-3-schroeven-bobs-knobs\/","url_meta":{"origin":112889,"position":1},"title":"Adjusting screws for the viewfinder of a 10 inch SCT f\/10, 3 screws | Bob\u2019s Knobs","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Bob's Knobs for 10 inch Schmidt-Cassegrain f\/10 with three screws on the secondary holder. Aligning by hand.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58069_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58069_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58069_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":112879,"url":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-een-8-inch-sct-f-10-3-schroeven-bobs-knobs\/","url_meta":{"origin":112889,"position":2},"title":"Adjusting screws for the viewfinder of an 8 inch SCT f\/10, 3 screws | Bob\u2019s Knobs","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Bob's Knobs card key buttons for 8 inch SCTs f\/10 with three screws on the secondary holder. Align by hand.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58065_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58065_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58065_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":112885,"url":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-een-10-inch-sct-f-10-6-schroeven-bobs-knobs\/","url_meta":{"origin":112889,"position":3},"title":"Adjusting screws for the viewfinder of a 10 inch SCT f\/10, 6 screws | Bob\u2019s Knobs","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Large buttons for the viewfinder holder with six screws from a 10 inch SCT f\/10. Focusing is then done by hand.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58070_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58070_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58070_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":112887,"url":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-de-meade-10-inch-sct-widefield-f-63-bobs-knobs\/","url_meta":{"origin":112889,"position":4},"title":"Adjusting screws for the viewfinder of the Meade 10 inch SCT widefield f\/6.3 | Bob\u2019s Knobs","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Adjustment knobs from Bob's Knobs for the secondary mirror of the Meade 10 inch SCT widefield f\/6.3.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58071_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58071_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58071_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":112907,"url":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-een-6-inch-sct-bobs-knobs\/","url_meta":{"origin":112889,"position":5},"title":"Adjustment screws for the rear mirror of a 6 inch SCT | Bob\u2019s Knobs","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Large adjustment buttons from Bob's Knobs for the secondary mirror of a 6 inch SCT, for collimation by hand.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/64446_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/64446_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/64446_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/112889","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=112889"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/112888"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=112889"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=112889"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=112889"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=112889"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}