{"id":112881,"date":"2026-10-09T16:52:42","date_gmt":"2026-10-09T14:52:42","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=112881"},"modified":"2026-10-09T20:31:51","modified_gmt":"2026-10-09T18:31:51","slug":"adjustment-screws-for-the-viewfinder-of-an-8-inch-sct-f-10-6-screws-bobs-knobs","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-een-8-inch-sct-f-10-6-schroeven-bobs-knobs\/","title":{"rendered":"Adjusting screws for the viewfinder of an 8 inch SCT f\/10, 6 screws | Bob\u2019s Knobs"},"content":{"rendered":"

Adjusting the focus in the dark with a small screwdriver is tricky, and with a holder with six screws it\u2019s even more fiddly. With Bob\u2019s Knobs on your 8-inch SCT, you replace the screws on the secondary mirror with larger buttons with a ribbed edge. This allows you to adjust the alignment with your fingers even when you can see little.<\/p>\n\n\n\n

This version is for 8 inch Schmidt-Cassegrains with f\/10, where the secondary holder has six screws. First, count how many screws are on your holder. You can find this type of telescope in the catadioptric telescopes<\/a>.<\/p>\n\n\n\n

Never remove all the screws at the same time, but replace them one by one so that the mirror stays securely in place. Then check the collimation on a bright star at high magnification, or with a Artificial star as training point<\/a> if the air doesn't cooperate. Small turns are enough.<\/p>\n\n\n\n

If your holder has three screws, then you have the set for three screws<\/a> needed.<\/p>","protected":false},"excerpt":{"rendered":"

Bob\u2019s Knobs for 8 inch Schmidt-Cassegrains f\/10 with six screws on the secondary holder. This way you can line up without a screwdriver.<\/p>","protected":false},"featured_media":112880,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1559],"product_cat":[56,3091],"product_tag":[],"class_list":["post-112881","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":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":112881,"position":0},"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":112881,"position":1},"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":112889,"url":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-een-12-inch-sct-f-10-3-of-4-schroeven-bobs-knobs\/","url_meta":{"origin":112881,"position":2},"title":"Adjusting screws for the viewfinder of a 12 inch SCT f\/10, 3 or 4 screws | Bob\u2019s Knobs","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Bob's Knobs for the secondary holder of a 12 inch SCT f\/10 with three or four screws. Collimate 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\/58072_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58072_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/58072_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":112881,"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. 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