{"product_id":"antlia-adjustable-aperture-diaphragm-for-5-cak","title":"Antlia Adjustable Aperture Diaphragm for 5Å CaK","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdjustable aperture from 2.0mm to 25mm\u003c\/li\u003e\n\u003cli\u003eDesigned for the Antlia Solar Discover 5Å CaK Assembly\u003c\/li\u003e\n\u003cli\u003e1.25\" adapter\u003c\/li\u003e\n\u003cli\u003eHelps filter out stray light to enhance image contrast\u003c\/li\u003e\n\u003cli\u003e34mm optical height\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAntlia Adjustable Aperture Diaphragm for 5Å CaK\u003c\/h2\u003e\n\u003cp\u003eThe Antlia Adjustable Aperture Diaphragm is a 1.25\" accessory for the Antlia Solar Discover 5Å CaK assembly that helps filter out stray light, enhancing image contrast. Its aperture adjusts from 2.0mm to 25mm in real time, and its optical height is 34mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFine-Tune Contrast with a 2.0-25mm Adjustable Aperture\u003c\/h3\u003e\n\u003cp\u003eIn solar imaging, stray light lowers the contrast of fine chromospheric detail. When used with the Solar Discover 5Å CaK assembly, this 1.25\" variable aperture diaphragm helps filter out stray light, enhancing image contrast.\u003c\/p\u003e\n\u003cp\u003eAntlia states that optimal contrast is reached at approximately half open (D12). The aperture can be adjusted in real time, so it can also be fine-tuned as needed for a specific condition.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated Accessory:\u003c\/strong\u003e Offered by Antlia as an optional accessory for the Solar Discover 5Å CaK assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustment Range (2.0 - 25mm):\u003c\/strong\u003e Adjustable in real time, with optimal contrast at approximately half open (D12).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" Adapter:\u003c\/strong\u003e The diaphragm uses a 1.25\" adapter and has an optical height of 34mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary purpose of the Antlia Adjustable Aperture Diaphragm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the Antlia Adjustable Aperture Diaphragm is to \u003cstrong\u003eenhance image contrast\u003c\/strong\u003e during solar imaging with the Antlia Solar Discover 5Å CaK assembly. It helps filter out stray light, which enhances image contrast. Antlia states that optimal contrast is reached at approximately half open (D12).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Antlia Adjustable Aperture Diaphragm improve CaK solar imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eImaging in Calcium-K (CaK) light reveals features in the Sun's chromosphere, and stray light lowers their contrast. Used with the Solar Discover 5Å CaK assembly, the diaphragm helps filter out stray light, enhancing image contrast. It can be adjusted in real time to suit the conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Antlia Adjustable Aperture Diaphragm compatible with other solar filters or telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia offers this diaphragm as an optional accessory \u003cstrong\u003efor the Antlia Solar Discover 5Å CaK assembly\u003c\/strong\u003e. Antlia does not state compatibility with other solar filters or telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"D12\" optimal contrast setting mean for the Antlia Adjustable Aperture Diaphragm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"D12\" notation refers to setting the diaphragm's aperture to approximately \u003cstrong\u003e12mm in diameter\u003c\/strong\u003e, which is about half its maximum opening of 25mm. Antlia states that optimal contrast is reached at approximately half open (D12), and that the diaphragm can be fine-tuned in real time as needed for a specific condition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set the Antlia Adjustable Aperture Diaphragm during a CaK imaging session?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia states that optimal contrast is reached at approximately half open (D12). Start there while watching the camera image, then fine-tune the aperture in real time as needed for the conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAdjustable (Variable) Aperture Diaphragm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAntlia Solar Discover 5Å CaK assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdjustable Aperture Range\u003c\/td\u003e\n\u003ctd\u003e2.0mm - 25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptimal Contrast Setting\u003c\/td\u003e\n\u003ctd\u003eApproximately half open (D12), adjustable in real time\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Height\u003c\/td\u003e\n\u003ctd\u003e34mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\nContact us for warranty details.\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"1.25\"","offer_id":51932625404189,"sku":"ANT-DIAPHRAGM-CAK5A","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-src-owvP9ygcw2wc42wc_17d0e245-cb0f-41e0-b79f-1ec83f57f3a0.jpg?v=1792550009","url":"https:\/\/davidastro.com\/en-int\/products\/antlia-adjustable-aperture-diaphragm-for-5-cak","provider":"David Astro","version":"1.0","type":"link"}