{"product_id":"starizona-rasa-8-modular-filter-slider-for-select-zwo-cooled-cameras","title":"Starizona Filter Slider for RASA 8 \u0026 ZWO Cooled Cameras","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables fast filter changes on the Celestron RASA 8\u003c\/li\u003e\n\u003cli\u003eDesigned for ZWO cooled cameras with 6.5mm back focus\u003c\/li\u003e\n\u003cli\u003eAccepts standard 2\" mounted filters\u003c\/li\u003e\n\u003cli\u003eUltra-thin 0.76\" (19.5mm) profile maintains critical spacing\u003c\/li\u003e\n\u003cli\u003eConnects via M42 female threads on both sides\u003c\/li\u003e\n\u003cli\u003eLightweight design at only 5 oz. (140g)\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\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\u003eStarizona Filter Slider for RASA 8 \u0026amp; ZWO Cooled Cameras\u003c\/h2\u003e\n\u003cp\u003eThe Starizona Filter Slider for the RASA 8 provides a seamless solution for changing 2\" filters without removing your camera, specifically engineered for ZWO cooled cameras requiring 6.5mm of back focus. This slider's minimal 0.76\" (19.5mm) thickness and M42 female threads are precision-machined to integrate directly with the RASA 8's stock camera adapter, preserving the telescope's critical optical spacing. The entire assembly weighs only 5 oz. (140g), adding minimal mass to the front of your optical tube.\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\u003eFast 2\" Filter Swaps on the RASA 8\u003c\/h3\u003e\n\u003cp\u003eThe primary challenge of imaging with the Celestron RASA 8 is the inability to use a traditional filter wheel due to back focus constraints. The Starizona Filter Slider solves this by allowing you to swap standard 2\" mounted filters in seconds. For imagers shooting LRGB sequences or switching between broadband and narrowband targets, this eliminates the need to remove the camera, re-check tilt, and refocus between filter changes, dramatically speeding up your workflow.\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\u003eA 19.5mm Profile for 6.5mm Back Focus Cameras\u003c\/h3\u003e\n\u003cp\u003eThis filter slider is not a universal accessory; its 0.76\" (19.5mm) profile is specifically calculated for ZWO cooled cameras that achieve 6.5mm of back focus once their stock 11mm M42 adapter ring is removed. The design correctly accounts for the added optical path of standard filter glass, ensuring the RASA 8's focal plane remains precisely on your camera sensor. The slider features M42 female threads on both the telescope and camera side for a direct, secure connection.\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\u003eRASA 8 Installation and Gasket Clearance\u003c\/h3\u003e\n\u003cp\u003eInstallation involves threading the slider between the RASA 8's stock M42 camera adapter and your ZWO camera's male M42 threads. Because some RASA 8 telescopes were shipped with thicker gaskets under the camera adapter retaining ring, clearance for the filter drawer can be an issue. If the drawer hits the ring, the original gasket must be replaced with a lower-profile version to allow the retaining ring to thread down farther, providing the necessary space. It is also critical to install the slider with the Starizona logo facing right-side up when the telescope is pointed at the sky to ensure proper orientation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich cameras work with the Starizona RASA 8 Filter Slider?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter slider is designed exclusively for ZWO cooled cameras that meet two specific requirements: \u003cstrong\u003emale M42 threads\u003c\/strong\u003e on the camera body and a \u003cstrong\u003e6.5mm back focus distance\u003c\/strong\u003e. This is typically achieved by removing the 11mm M42 adapter ring that comes with many ZWO cameras. It will not work with cameras that have a different back focus, such as 17.5mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy filter drawer hits the retaining ring on my RASA 8. What's wrong?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThere are two common causes for this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket Thickness:\u003c\/strong\u003e Your RASA 8 may have a thick factory gasket under the camera adapter retaining ring. This prevents the ring from seating low enough. You will need to replace it with a thinner gasket to provide clearance for the drawer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncorrect Orientation:\u003c\/strong\u003e The filter slider may be installed upside down. The Starizona logo should be readable and right-side up when the telescope is pointing towards the zenith. If it's upside down, the drawer offset will be incorrect and interfere with the ring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Starizona Filter Slider for a narrowband sequence on the Cygnus Loop with my RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal application. The RASA 8's fast optics excel at capturing faint emission nebulae like the Cygnus Loop (NGC 6960, 6992). This filter slider allows you to quickly switch between H-alpha and OIII filters to capture different structures in the nebula without having to disassemble your imaging train, saving significant time and effort.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Starizona Filter Slider change the back focus of my RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, when used with the correct camera (6.5mm back focus) and a standard 2\" mounted filter, the slider is designed to be optically neutral. Its physical thickness of 19.5mm is engineered to account for the optical path length of the filter glass, precisely maintaining the RASA 8's required back focus and delivering sharp stars across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a ZWO camera with 17.5mm back focus. Can I use this filter slider with my RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter slider will not work. It is specifically designed to consume the correct amount of back focus for cameras set to 6.5mm. Using it with a camera that has 17.5mm of back focus would place the sensor far outside the RASA 8's focal plane, making it impossible to achieve focus and resulting in poor optical performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to remove the optical window on the RASA 8 to use the Starizona Filter Slider?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the optical window in the RASA 8 camera adapter should remain in place. The filter slider is designed to work with the complete, stock RASA 8 optical train. You simply thread it between the existing camera adapter and your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e3.10\" (78.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e0.76\" (19.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads (Telescope \u0026amp; Camera)\u003c\/td\u003e\n\u003ctd\u003eM42 Female Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccepted Filter Size\u003c\/td\u003e\n\u003ctd\u003eStandard 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e5 oz. (140g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/starizona-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eStarizona Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":68033924006173,"sku":"STZ-MFS-RASA8","price":209.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Starizona-Filter-Slider-RASA-8-ZWO-Cooled-1_31394f76-d29b-4588-8e26-a91e937636c6.jpg?v=1794375608","url":"https:\/\/davidastro.com\/products\/starizona-rasa-8-modular-filter-slider-for-select-zwo-cooled-cameras","provider":"David Astro","version":"1.0","type":"link"}