{"id":112865,"date":"2026-10-09T16:52:38","date_gmt":"2026-10-09T14:52:38","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=112865"},"modified":"2026-10-09T20:31:40","modified_gmt":"2026-10-09T18:31:40","slug":"adjustment-screws-for-the-viewfinder-of-the-orange-celestron-c8-c8org-bobs-knob","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/afstelschroeven-voor-de-vangspiegel-van-de-oranje-celestron-c8-c8org-bobs-knobs\/","title":{"rendered":"Adjustment screws for the viewfinder of the orange Celestron C8 (C8org) | Bob\u2019s Knobs"},"content":{"rendered":"<p class=\"wp-block-paragraph\">If you still use a classic orange Celestron C8, you know how flimsy the small collimation screws on the secondary mirror are. With Bob\u2019s Knobs for the orange C8, you replace them with screws with a large knob. Then you adjust the mirror with your fingers instead of with a screwdriver right in front of the corrector plate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Over the years, several versions of the C8 have been produced. So please check beforehand whether your telescope is indeed the orange version for which this set is intended. You can see what the current generation looks like in the photo below. <a href=\"https:\/\/www.telescoop.nl\/en\/telescopes\/catadioptric-telescopes\/schmidt-cassegrain-telescopes\/\">Schmidt-Cassegrain telescopes<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Replace the screws one by one and then collimate again on an unfocused star. If you often take the C8 outside, a <a href=\"https:\/\/www.telescoop.nl\/en\/dew-band-for-7-and-8-inch-telescopes-astrozap\/\">rainband for 7 and 8 inch<\/a> the corrector plate is dry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There is a model for the C8 from after 1980. <a href=\"https:\/\/www.telescoop.nl\/en\/bobs-knobs-adjustment-screws-for-celestron-sct-8-post-1980-standard\/\">separate set with standard wire<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Adjustment knobs from Bob\u2019s Knobs for the secondary mirror of the classic orange Celestron C8. Collimate without tools.<\/p>","protected":false},"featured_media":112864,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1559],"product_cat":[56,3091],"product_tag":[],"class_list":["post-112865","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":111636,"url":"https:\/\/www.telescoop.nl\/en\/zwo-seestar-s50-pro\/","url_meta":{"origin":112865,"position":0},"title":"ZWO Seestar S50 Pro","author":"Info telescoop","date":"25-08-2026","format":false,"excerpt":"The ZWO Seestar S50 Pro is the successor to the Seestar S50: 50 mm quadruplet APO (260 mm, f\/5.2), two 8.3 MP 4K sensors, a 63-degree wide-angle camera for the Milky Way up to 8K, three built-in filters, a 10,000 mAh battery (up to 9 hours), and 128 GB of storage. Four capture modes for...","rel":"","context":"With 5 comments","block_context":{"text":"With 5 comments","link":"https:\/\/www.telescoop.nl\/en\/zwo-seestar-s50-pro\/#comments"},"img":{"alt_text":"ZWO Seestar S50 Pro hero","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/08\/zwo-seestar-s50-pro.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/08\/zwo-seestar-s50-pro.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/08\/zwo-seestar-s50-pro.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/08\/zwo-seestar-s50-pro.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/112865","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=112865"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/112864"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=112865"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=112865"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=112865"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=112865"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}