{"id":28633,"date":"2025-09-18T21:28:03","date_gmt":"2025-09-18T19:28:03","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=28633"},"modified":"2025-12-19T13:18:07","modified_gmt":"2025-12-19T12:18:07","slug":"optolong-ubvri-photometric-filter-set-2","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/optolong-ubvri-fotometrische-filterset-2\/","title":{"rendered":"Optolong UBVRI Photometric Filter Set 2\u2033"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The Optolong UBVRI Photometric Filter Set 2\u2033 is designed for scientific and semi-professional astrophotography. The set contains five carefully crafted filters: <strong>U (ultraviolet), B (blue), V (visual green), R (red) and I (near-infrared)<\/strong>. Together, they provide the standard photometric bandwidths used worldwide in astronomy for accurate measurements and comparable data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Each filter is made of high-quality Schott glass (1.85 mm thick) and equipped with a multi-layer anti-reflection coating. Thanks to the IBAD (ion beam assisted deposition) process, the coatings are scratch-resistant, color stable and insensitive to temperature fluctuations. The filters are double-sided polished to an accuracy of \u03bb\/4 and meet a polishing grade of 60\/40 according to MIL-O-13830. This ensures high transmission in the pass range and strong blocking in the blocked range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The set comes in a sturdy plastic box with EVA foam lining to keep the filters safely protected during transport and storage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Application<\/strong><br>The Optolong UBVRI Filter Set is ideal for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accurate photometric measurements of stars and variable objects<\/li>\n\n\n\n<li>Scientific deep-sky observing projects<\/li>\n\n\n\n<li>Astrophotography requiring international comparability of data<\/li>\n\n\n\n<li>Use in 2\u2033 filter wheels for CCD and CMOS cameras<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Specifications<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Filters: U, B, V, R, I (ultraviolet, blue, green, red, infrared)<\/li>\n\n\n\n<li>Mount: 2\u2033 round mount (suitable for filter wheels)<\/li>\n\n\n\n<li>Material: shot glass<\/li>\n\n\n\n<li>Optics coating: multi-coated<\/li>\n\n\n\n<li>Transmission: approx. 70% in passage range<\/li>\n\n\n\n<li>Surface accuracy: \u03bb\/4<\/li>\n\n\n\n<li>Polishing quality: 60\/40 (MIL-O-13830)<\/li>\n\n\n\n<li>Application: photographic, not visual<\/li>\n\n\n\n<li>Protective packaging: plastic box with EVA foam lining<\/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=\"368\" data-end=\"804\">\u00a0<\/p>\n<p data-start=\"175\" data-end=\"366\">Optolong UBVRI Fotometrische Filterset 2&#8243; wordt geleverd met vijf filters (U, B, V, R, I) van hoogwaardig Schott-glas voor nauwkeurige wetenschappelijke fotometrie.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"featured_media":28638,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1548],"product_cat":[56,587,588,3138],"product_tag":[],"class_list":["post-28633","product","type-product","status-publish","has-post-thumbnail","product_brand-optolong","product_cat-telescoop-accessoires","product_cat-camera-accessoires","product_cat-filters","product_cat-imaging-filters-smalband-en-lrgb","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":28651,"url":"https:\/\/staging.telescoop.nl\/en\/optolong-lrgb-filterset-2\/","url_meta":{"origin":28633,"position":0},"title":"Optolong LRGB Filter Set 2\u2033","author":"","date":"18-09-2025","format":false,"excerpt":"\u00a0 Optolong LRGB Filterset 2\" wordt geleverd met luminance-, rood-, groen- en blauwfilter voor kleurechte deep-sky fotografie met monochrome camera\u2019s.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong LRGB Filterset 2\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-LRGB-Filter-Set-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-LRGB-Filter-Set-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-LRGB-Filter-Set-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-LRGB-Filter-Set-2-.jpg?resize=700%2C400&ssl=1 2x, 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1,25\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-Planetary-Filter-Set-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-Planetary-Filter-Set-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-Planetary-Filter-Set-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-Planetary-Filter-Set-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-Planetary-Filter-Set-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-Planetary-Filter-Set-1-25-.jpg?resize=1400%2C800&ssl=1 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SHO-kleuren.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Optolong Filters SHO Filter Kit 7nm 2\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Optolong-Filters-SHO-Filter-Kit-7nm-2-.jpg?resize=1050%2C600&ssl=1 3x, 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