{"id":24882,"date":"2025-08-03T15:00:18","date_gmt":"2025-08-03T13:00:18","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=24882"},"modified":"2026-09-04T13:59:50","modified_gmt":"2026-09-04T11:59:50","slug":"red-color-filter-2-inch-omegon-25","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/rood-kleurfilter-2-inch-omegon-25\/","title":{"rendered":"Omegon Red Color Filter #25 2-inch"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>Omegon Red Color Filter #25 2-inch: The Standard for Mars Polar Caps<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This red color filter blocks blue and green light almost completely. This creates a very strong contrast between bluish-tinted structures and the bright details on the surface of Mars, Jupiter, and Saturn.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The filter is primarily used for the polar caps on Mars, where it is the standard choice. The strong attenuation does require a wide aperture: on smaller telescopes the image becomes too dark.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-25-rood-2-.jpg\" alt=\"Omegon Red Color Filter #25 2-inch\" title=\"\"><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Warts #25, red<\/li><li>Blocks blue and green almost completely<\/li><li>Standard filter for the polar caps on Mars<\/li><li>Standard 2-inch thread<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Compatibility<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For telescopes with a 2-inch light path and a generous aperture. Color filters work best on a telescope with an aperture of approximately 100 mm or more: the filter reduces light, and the aperture must be able to compensate for that.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Type<\/strong><\/td><td>Color filter<\/td><\/tr><tr><td><strong>Wart number<\/strong><\/td><td>#25<\/td><\/tr><tr><td><strong>Color<\/strong><\/td><td>Red<\/td><\/tr><tr><td><strong>Mount<\/strong><\/td><td>2 inches<\/td><\/tr><tr><td><strong>Glass<\/strong><\/td><td>Tinted optical glass<\/td><\/tr><tr><td><strong>Note<\/strong><\/td><td>Strongly dampening, requires a larger opening<\/td><\/tr><tr><td><strong>Observation goals<\/strong><\/td><td>Moon and planets<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">You can find more accessories for this merk at the <a href=\"\/en\/brands\/omegon\/\">Omegon merk Page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Red Warts #25 color filter in a 2-inch mount. It blocks blue and green almost completely and is the standard for polar caps on Mars.<\/p>","protected":false},"featured_media":24887,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[126],"product_cat":[3140,56],"product_tag":[],"class_list":["post-24882","product","type-product","status-publish","has-post-thumbnail","product_brand-omegon","product_cat-maan-en-planetenfilters-kleurfilters","product_cat-telescoop-accessoires","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":12891,"url":"https:\/\/www.telescoop.nl\/en\/omegon-set-kleurenfilters-125-6-delig\/","url_meta":{"origin":24882,"position":0},"title":"Omegon Color Filter Set 1.25 inch (6-piece)","author":"Info telescoop","date":"11-03-2025","format":false,"excerpt":"Six-piece 1.25-inch color filter set, including orange #21, red #25, yellow #12, and light blue #82A. The most affordable way to get started with color filters.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/03\/Omegon-Set-kleurenfilters-1-25-6-delig--e1741688202542.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":24864,"url":"https:\/\/www.telescoop.nl\/en\/oranje-kleurfilter-2-inch-omegon-21\/","url_meta":{"origin":24882,"position":1},"title":"Omegon Orange Color Filter #21 2-inch","author":"","date":"03-08-2025","format":false,"excerpt":"Oranje Wratten #21 kleurfilter in 2 inch vatting. Versterkt stofstormen en poolkappen op Mars en de banden van Jupiter en Saturnus.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Orange Farbfilter 2 Zoll \u2013 Omegon #21","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-21-oranje-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-21-oranje-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-21-oranje-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-21-oranje-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-21-oranje-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-21-oranje-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":24870,"url":"https:\/\/www.telescoop.nl\/en\/lichtrood-kleurfilter-125-inch-omegon-23a\/","url_meta":{"origin":24882,"position":2},"title":"Omegon Light Red Color Filter #23A 1.25 inch","author":"","date":"03-08-2025","format":false,"excerpt":"Lichtrood Wratten #23A kleurfilter voor Mars. Maakt poolkappen, stofstormen en donkere gebieden op het oppervlak duidelijker zichtbaar.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Hellrot Farbfilter 1,25 Zoll \u2013 Omegon #23A","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":24876,"url":"https:\/\/www.telescoop.nl\/en\/lichtrood-kleurfilter-2-inch-omegon-23a\/","url_meta":{"origin":24882,"position":3},"title":"Omegon Light Red Color Filter #23A 2-inch","author":"","date":"03-08-2025","format":false,"excerpt":"Lichtrood Wratten #23A kleurfilter in 2 inch vatting. Vergroot het contrast op Mars en helpt bij structuren in de atmosferen van Jupiter en Saturnus.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Hellrot Farbfilter 2 Zoll \u2013 Omegon #23A","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-23A-lichtrood-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":7749,"url":"https:\/\/www.telescoop.nl\/en\/bresser-kleurfilterset-essential-125\/","url_meta":{"origin":24882,"position":4},"title":"Bresser Color Filter Set Essential 1.25\u2033","author":"Info telescoop","date":"12-02-2025","format":false,"excerpt":"Bresser Essential Color Filter Set with four color filters (red, green, blue, yellow) for increased contrast on the moon and planets. Fits any 1.25 inch filter thread.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/02\/Bresser-Filters-Colour-filter-set-Essential-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/02\/Bresser-Filters-Colour-filter-set-Essential-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/02\/Bresser-Filters-Colour-filter-set-Essential-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/02\/Bresser-Filters-Colour-filter-set-Essential-1-25-.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":24918,"url":"https:\/\/www.telescoop.nl\/en\/blauw-kleurfilter-2-inch-omegon-80a\/","url_meta":{"origin":24882,"position":5},"title":"Omegon Blue Color Filter #80A 2-inch","author":"","date":"03-08-2025","format":false,"excerpt":"Blauw Wratten #80A kleurfilter in 2 inch vatting. Het veelzijdigste kleurfilter voor Jupiter, Saturnus en Mars.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Blaufilter 2 Zoll \u2013 Omegon #80A","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-80A-blauw-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-80A-blauw-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-80A-blauw-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-80A-blauw-2-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-80A-blauw-2-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/08\/Omegon-Filters-kleurfilter-80A-blauw-2-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/24882","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=24882"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/24887"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=24882"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=24882"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=24882"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=24882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}