{"product_id":"idas-ha-oiii-dusk-to-dawn-dtd-filters","title":"IDAS Ha \u0026 OIII Dusk to dawn (DTD) Filters","description":"\u003ch2\u003eIDAS Ha \u0026amp; OIII Dusk to dawn (DTD) Filters\u003c\/h2\u003e\n\u003cp\u003eA new generation filter covering multiple objects including comets, galaxies, the Milky Way, and emission and reflection nebulae, by making use of the extra transmission in the NIR region.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe IDAS DTD filter not only passes through the Ha and OIII regions in the same manner as of the IDAS NBZ, but also provides a pass band for comet ion tails in the visible spectrum range (400nm to 700nm, susceptible to light pollutions). This filter furthermore enhances the contrast of the continuous spectrum lights from comet dust tails, galaxies and the Milky Way by making use of the NIR region that is hardly interferenced by light pollutions. The DTD filter makes it possible to shoot more objects in the visible to NIR spectrum range at higher contrasts.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eOptical filters such as IDAS DTD and GNB utilizing infrared tend to cause haloing in the NUV and NIR regions. This is because the anti-reflection properties of off-the-shelf cameras' optical systems (oiptical window and sensor cover glass) are optimized for the visible spectrum only, not for the NIR region. Thus, haoling at the camera end in the unoptimized region becomes more apparent, coupled with haloing from the filter itself.\u003cbr\u003eHere is a rough estimation of the magnitude of haoling where the haloing maginute of NBZ (NBZex) is counted as 1:\u003cbr\u003eDTD + IMX294 sensor results in 7.9 times\u003cbr\u003eDTD + IMX585 sensor results in 23.7 times\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eM31 Photo taken by Mr. Numazawa: \u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/M31-011124-numazawa.jpg?v=1717002927\u0026amp;width=700\" width=\"1308\" height=\"891\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eComet Nishimura Photos taken by Mr. Numazawa:\u003c\/span\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/230827C2023P1-JPL.png?v=1717002992\u0026amp;width=700\" width=\"947\" height=\"1423\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eComet 12P\/Pons-Brooks Photo taken by Mr. Numazawa:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cimg height=\"1534\" width=\"970\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/12P-Pons-Brooks-011124-numazawa.jpg?v=1717003086\u0026amp;width=700\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cimg height=\"745\" width=\"1334\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_b3fb8ec0-569a-40d0-8ae5-c5eb6e5a049c.png?v=1717003268\u0026amp;width=700\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"784\" width=\"1405\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_37fcf8a8-f782-495e-8c8a-f8d38599aac3.png?v=1717003393\u0026amp;width=700\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"724\" width=\"1297\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/4_61302966-4126-4bcf-954c-2bc089374508.png?v=1717003408\u0026amp;width=700\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"882\" width=\"1618\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/dtd-alp.png?v=1717003429\u0026amp;width=700\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eDYD FIlter at selected size :\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan data-sheets-root=\"1\" data-sheets-value='{\"1\":2,\"2\":\"48S\"}' data-sheets-userformat='{\"2\":12797,\"3\":{\"1\":0,\"3\":1},\"5\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"6\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"7\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"8\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"9\":1,\"10\":0,\"11\":4,\"15\":\"游ゴシック\",\"16\":8}' data-sheets-textstyleruns='{\"1\":0,\"2\":{\"3\":\"游ゴシック\",\"4\":8}}'\u003e\u003cstrong\u003eM48 x 0.75\u003c\/strong\u003e, with \u003cstrong\u003e2.5mm\u003c\/strong\u003e substrate thickness (48S)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan data-sheets-root=\"1\" data-sheets-value='{\"1\":2,\"2\":\"48S\"}' data-sheets-userformat='{\"2\":12797,\"3\":{\"1\":0,\"3\":1},\"5\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"6\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"7\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"8\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"9\":1,\"10\":0,\"11\":4,\"15\":\"游ゴシック\",\"16\":8}' data-sheets-textstyleruns='{\"1\":0,\"2\":{\"3\":\"游ゴシック\",\"4\":8}}'\u003e\u003cstrong\u003eM48 x 0.75\u003c\/strong\u003e with \u003cstrong\u003e2mm\u003c\/strong\u003e substrate thickness (48ST2)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan data-sheets-root=\"1\" data-sheets-value='{\"1\":2,\"2\":\"48S\"}' data-sheets-userformat='{\"2\":12797,\"3\":{\"1\":0,\"3\":1},\"5\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"6\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"7\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"8\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"9\":1,\"10\":0,\"11\":4,\"15\":\"游ゴシック\",\"16\":8}' data-sheets-textstyleruns='{\"1\":0,\"2\":{\"3\":\"游ゴシック\",\"4\":8}}'\u003e\u003cstrong\u003eM52 x 0.75\u003c\/strong\u003e with \u003cstrong\u003e2mm \u003c\/strong\u003esubstrate thickness (52ST2)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan data-sheets-root=\"1\" data-sheets-value='{\"1\":2,\"2\":\"48S\"}' data-sheets-userformat='{\"2\":12797,\"3\":{\"1\":0,\"3\":1},\"5\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"6\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"7\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"8\":{\"1\":[{\"1\":2,\"2\":0,\"5\":{\"1\":2,\"2\":0}},{\"1\":0,\"2\":0,\"3\":3},{\"1\":1,\"2\":0,\"4\":1}]},\"9\":1,\"10\":0,\"11\":4,\"15\":\"游ゴシック\",\"16\":8}' data-sheets-textstyleruns='{\"1\":0,\"2\":{\"3\":\"游ゴシック\",\"4\":8}}'\u003eFor \u003cstrong\u003eCanon EF-EOSR\u003c\/strong\u003e (DRT)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eIDAS 3-Year Warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eDTD-DRT Manual\u003c\/p\u003e\n\u003c!----\u003e","brand":"Astronomy Plus","offers":[{"title":"M48 with 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cams","offer_id":52184008622309,"sku":"fpw1787937576263","price":124.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/4561\/8405\/files\/idas-ha-oiii-dusk-to-dawn-dtd-filters_1.png?v=1787937580","url":"https:\/\/perovia.shop\/products\/idas-ha-oiii-dusk-to-dawn-dtd-filters","provider":"My Store","version":"1.0","type":"link"}