{"id":28924,"date":"2025-09-20T19:15:41","date_gmt":"2025-09-20T17:15:41","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=28924"},"modified":"2026-06-09T11:46:51","modified_gmt":"2026-06-09T09:46:51","slug":"optolong-filters-clear-sky-filter-77mm","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/optolong-filters-clear-sky-filter-77mm\/","title":{"rendered":"Optolong Clear Sky Filter 77mm"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Optolong Filters Clear Sky Filter 77mm is specially designed for photographers who want to enhance starry skies, auroras and night shots with wide-angle lenses. The filter has a 77mm filter thread and can be screwed directly in front of photo lenses, making it a practical solution for astrophotography in combination with DSLRs and system cameras.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The filter blocks disturbing yellow light from, for example, street lamps, something that is not easy to correct in post-processing. This darkens the sky background and significantly improves the contrast of stars and deep-sky objects. The applied neodymium oxide in the optical glass intensifies red and brown tones, which provides additional depth and vividness not only in astrophotography but also in nature photography, twilight images and autumn colors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike commonly used interference filters (such as CLS or UHC), this Clear Sky filter also works for wide-angle shots. In fact, interference filters rely on perpendicular light, making them often unsuitable for wide fields. This filter enables wide-angle photos of the Milky Way or aurora without complicated intermediate rings or mounting solutions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Observation goals<\/strong><br>The Optolong Clear Sky filter is ideal for night photographers who want to capture the starry sky or aurora with wide-angle lenses, as well as for creative nature photography at dusk or sunset. It is not intended for visual observation through a telescope, but purely for photographic applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Specifications<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type: Broadband filter<\/li>\n\n\n\n<li>Diameter: 77 mm (filter thread for photo lenses)<\/li>\n\n\n\n<li>Material: Glass with neodymium oxide<\/li>\n\n\n\n<li>Mount: Aluminum<\/li>\n\n\n\n<li>Coating: Multiple plane-parallel coating<\/li>\n\n\n\n<li>Application:\n<ul class=\"wp-block-list\">\n<li>\u2713 Photography with wide-angle lenses<\/li>\n\n\n\n<li>\u2713 Anti-light pollution<\/li>\n\n\n\n<li>\u2713 Galaxies and star clusters<\/li>\n\n\n\n<li>\u2713 AllSky and meteors<\/li>\n\n\n\n<li>\u2713 Aurora and Milky Way shots<\/li>\n\n\n\n<li>\u2717 Visual use by telescope not suitable<\/li>\n<\/ul>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<article class=\"w-full text-token-text-primary focus-visible:outline-2 focus-visible:outline-offset-[-4px]\" dir=\"auto\" data-testid=\"conversation-turn-35\" data-scroll-anchor=\"true\">\n<div class=\"text-base my-auto mx-auto py-[18px] px-6\">\n<div class=\"mx-auto flex flex-1 text-base gap-4 md:gap-5 lg:gap-6 md:max-w-3xl lg:max-w-[40rem] xl:max-w-[48rem]\">\n<div class=\"group\/conversation-turn relative flex w-full min-w-0 flex-col agent-turn @xs\/thread:px-0 @sm\/thread:px-1.5 @md\/thread:px-4\">\n<div class=\"flex-col gap-1 md:gap-3\">\n<div class=\"flex max-w-full flex-col flex-grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 whitespace-normal break-words text-start [.text-message+&amp;]:mt-5\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"28a009d2-3136-4224-8ee5-30c9a1a2ece5\" data-message-model-slug=\"gpt-4o\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[3px]\">\n<div class=\"markdown prose w-full break-words dark:prose-invert dark\">\n<p data-start=\"383\" data-end=\"774\">\u00a0<\/p>\n<p data-start=\"158\" data-end=\"381\">Optolong Filters Clear Sky Filter 77mm wordt geleverd met aluminium vatting en neodymiumglas \u2013 breedbandfilter voor fotografie van sterrenhemel, poollicht en nachtopnames met groothoekobjectieven.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"featured_media":28933,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1548],"product_cat":[56,587,588],"product_tag":[],"class_list":["post-28924","product","type-product","status-publish","has-post-thumbnail","product_brand-optolong","product_cat-telescoop-accessoires","product_cat-camera-accessoires","product_cat-filters","product_shipping_class-licht","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":105543,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-skyline-travel-70\/","url_meta":{"origin":28924,"position":0},"title":"Levenhuk Skyline Travel 70 - 70\/400 Refractor","author":"Abdullah Ibrar","date":"03-04-2026","format":false,"excerpt":"The Levenhuk Skyline Travel 70 \u2013 70\/400 Refractor comes with 10mm and 20mm eyepieces, a 3x Barlow lens, a 5x24 finderscope, a diagonal prism, an aluminum tripod, and a backpack. This compact travel telescope is ideal for observing the Moon, bright planets, and nature.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk Skyline Travel 70 compact refractor with included backpack for easy transportation","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/levenhuk-telescope-skyline-travel-70_ZHSMksd_500_784c0dc006013c7ff5ad43e1c4c51569.webp?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":107604,"url":"https:\/\/www.telescoop.nl\/en\/televue-tele-pod-advanced-azimutale-montering\/","url_meta":{"origin":28924,"position":1},"title":"TeleVue Tele-Pod Advanced \u2013 Azimuth Mount","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"TeleVue Tele-Pod Advanced \u2013 azimutale montering wordt geleverd met aluminium statief, transporttas en biedt soepele bediening voor lichte telescopen. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Montering Tele-Pod Advanced close-up van de azimutale montagekop op zwart geanodiseerd aluminium statief met blauwe accentring op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Montering-Tele-Pod-Advanced-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Montering-Tele-Pod-Advanced-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Montering-Tele-Pod-Advanced-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Montering-Tele-Pod-Advanced-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":106246,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-discovery-spark-767-az\/","url_meta":{"origin":28924,"position":2},"title":"Levenhuk Discovery Spark 767 AZ \u2013 76\/700 Newtonian Reflector","author":"Abdullah Ibrar","date":"05-04-2026","format":false,"excerpt":"The Levenhuk Discovery Spark 767 AZ \u2013 76\/700 Newtonian reflector comes with SR4mm, H12.5mm, and H20mm eyepieces, a 2x Barlow lens, an optical finder, an aluminum tripod with an accessory tray, and the colorful knowledge book \u201cSpace. Not an Empty Void.\u201d Ideal for beginners who want to discover the Moon, planets, and deep-sky objects.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk Discovery Spark 767 AZ complete set met Newton-reflector op alt-azimut montering en aluminium statief op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/79071_discovery-spark-767-az-telescope_00_500_8a8d4daec6536c85fe839f5bcbed1b02.webp?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":104875,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-labzz-t3\/","url_meta":{"origin":28924,"position":3},"title":"Levenhuk LabZZ T3 - 60\/700 Refractor","author":"Abdullah Ibrar","date":"24-03-2026","format":false,"excerpt":"Levenhuk LabZZ T3 - 60\/700 Refractor comes with 4mm eyepiece, 12.5mm eyepiece, 1.5x eyepiece, 3x Barlow lens, 5x optical viewfinder, zenith mirror and aluminum tripod with accessory tray.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk LabZZ T3 - 60\/700 Refractor aluminium statief met accessoirebak","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/03\/Levenhuk-LabZZ-T3-60700-Refractor-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":105023,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-blitz-50-base\/","url_meta":{"origin":28924,"position":4},"title":"Levenhuk Blitz 50 BASE \u2013 50\/600 Refractor","author":"Abdullah Ibrar","date":"01-04-2026","format":false,"excerpt":"The Levenhuk Blitz 50 BASE \u2013 50\/600 Refractor comes with 6mm and 20mm eyepieces, a 3x Barlow lens, a 5x24 finder scope, a diagonal mirror, and an aluminum tripod. This user-friendly beginner telescope is ideal for observing the Moon, bright objects, and simple daytime nature observation.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk Blitz 50 BASE achromatic refractor on a fully extended aluminum tripod, showing the complete setup from the front.","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/77098_levenhuk-blitz-50-base-telescope_00.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":107590,"url":"https:\/\/www.telescoop.nl\/en\/televue-oculairtas-transporttas\/","url_meta":{"origin":28924,"position":5},"title":"TeleVue Oculairtas \u2013 Carrying Case","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"TeleVue Oculairtas \u2013 transporttas wordt geleverd met stevige foamvoering en biedt ruimte aan maximaal 13 oculairs en accessoires.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Transporttas Oculairtas gesloten grijze nylon oculairtas met handgrepen, ritssluiting en schouderriem op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Transporttas-Oculairtas-5.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Transporttas-Oculairtas-5.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Transporttas-Oculairtas-5.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Transporttas-Oculairtas-5.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/28924","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=28924"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/28933"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=28924"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=28924"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=28924"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=28924"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}