{"product_id":"baader-planetarium-solar-projection-screen-bsps","title":"Baader Planetarium Baader Solar Projection Screen (BSPS)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSafe, Enclosed Solar Projection\u003c\/li\u003e\n\u003cli\u003eIdeal for Group Viewing and Public Outreach\u003c\/li\u003e\n\u003cli\u003eObserve Sunspots, Limb Darkening, and Eclipses\u003c\/li\u003e\n\u003cli\u003eCompatible with T-2 Eyepiece Projection Adapters\u003c\/li\u003e\n\u003cli\u003eIncludes Cardboard Housing Kit with Option for 3D Printing\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\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\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\u003eBaader Solar Projection Screen (BSPS)\u003c\/h2\u003e\n\u003cp\u003eThe Baader Solar Projection Screen (BSPS) offers a completely safe method for observing the Sun, projecting a clear image for small groups to view together. This closed-system design eliminates the risks of open projection, making it ideal for tracking sunspots, limb darkening, and the progression of a solar eclipse without any danger of accidental viewing through the eyepiece.\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\u003eSafe Solar Projection: A Closed System for Group Viewing\u003c\/h3\u003e\n\u003cp\u003eUnlike traditional open projection screens, the BSPS creates an enclosed light path from the eyepiece to the viewing surface. This design prevents anyone from accidentally placing a hand in the focused beam of light or looking directly into the eyepiece, making it an exceptionally safe tool for educational settings and public events.\u003c\/p\u003e\n\u003cp\u003eThe rear-projection screen allows multiple people to observe solar phenomena simultaneously. When used with a tracking mount, you can follow the Sun for hours, watching sunspots traverse the solar disk or monitoring the steady progress of a solar eclipse in real-time.\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\u003eIntegrating the BSPS: Telescope and Accessory Requirements\u003c\/h3\u003e\n\u003cp\u003eThe Solar Projection Screen is designed for use with refractor telescopes equipped with a star diagonal or prism. To reduce heat stress on your optics, refractors with faster focal ratios are recommended, and stopping down the aperture on larger instruments may be necessary for prolonged viewing sessions.\u003c\/p\u003e\n\u003cp\u003eA complete setup requires a variable eyepiece projection adapter with a T-2 thread, such as the Baader OPFA, and a suitable glass or metal eyepiece like the Baader Classic Orthos. The BSPS connects to star diagonals using a standard 2\" nosepiece, creating a secure and straightforward attachment to your existing equipment.\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\u003eBeyond Basic Viewing: Public Outreach and Polar Alignment\u003c\/h3\u003e\n\u003cp\u003eThe BSPS excels in public outreach scenarios. By mounting it on a small guide scope or finder that is co-aligned with a larger, solar-filtered telescope, you can provide a live projected view for waiting guests. This keeps the line moving and shows everyone what to expect when their turn at the main eyepiece arrives.\u003c\/p\u003e\n\u003cp\u003eFor amateur astronomers, the screen serves a dual purpose as a daytime polar alignment aid. By turning off your mount's tracking, you can observe the Sun's drift across the projection surface. The direction of drift provides a clear, immediate indication of how to adjust your mount's altitude and azimuth for a more precise alignment.\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\u003eBuild Your Projector: Cardboard Kit or 3D Printed Housing\u003c\/h3\u003e\n\u003cp\u003eThe BSPS is supplied as a component kit that you assemble. It includes the specialized projection screen, a T-2 thread adapter, and a pre-cut, three-piece cardboard kit with pre-mounted adhesive strips for easy construction of the housing.\u003c\/p\u003e\n\u003cp\u003eFor a more durable and permanent solution, Baader provides free downloadable STL files. This allows you to produce a robust plastic housing and protective cover using your own 3D printer, offering a modern, customizable alternative to the included cardboard structure.\u003c\/p\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\"\u003eHow can I use the Baader Solar Projection Screen (BSPS) at a public outreach event?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader BSPS is perfect for outreach. You can attach it to a small guide scope or finder scope that is aligned with your main telescope (which should have its own dedicated solar filter). This allows you to show a projected image of the Sun to people waiting in line, keeping them engaged while also confirming the Sun is still centered for the person at the main eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Baader BSPS help me polar align my German Equatorial Mount during the day?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. After pointing your telescope at the Sun with the BSPS attached, simply turn off the mount's tracking. By observing the direction the Sun's image drifts across the screen, you can determine your polar alignment error. The drift direction tells you precisely how to adjust the mount in altitude and azimuth for a much more accurate alignment, a task that is typically difficult to perform in daylight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader Solar Projection Screen (BSPS) safe to use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader BSPS is designed with safety as the top priority. It creates a \u003cstrong\u003eclosed, enclosed system\u003c\/strong\u003e from the eyepiece to the screen. This prevents anyone from accidentally putting a hand or eye in the focused, intense light path, which is a significant risk with open projection methods.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of telescope works best with the Baader Solar Projection Screen (BSPS)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe BSPS is ideally suited for \u003cstrong\u003erefractor telescopes\u003c\/strong\u003e. To minimize heat build-up in the star diagonal and eyepiece, telescopes with faster focal ratios are recommended. For refractors with large apertures, it's advisable to use an aperture stop to reduce the heat load during long observation periods.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat other accessories do I need to use the Baader BSPS?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo use the Baader BSPS, you will need the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA telescope suitable for solar projection (ideally a refractor).\u003c\/li\u003e\n\u003cli\u003eA star diagonal or prism with a 2\" nosepiece connection.\u003c\/li\u003e\n\u003cli\u003eA variable eyepiece projection adapter with a T-2 thread (like the Baader OPFA).\u003c\/li\u003e\n\u003cli\u003eA glass\/metal eyepiece suitable for solar projection (like a Baader Classic Ortho).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I have to build the Baader Solar Projection Screen (BSPS) myself?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, some assembly is required. The Baader BSPS kit includes the screen, a T-2 adapter, and a pre-cut cardboard housing that you assemble. For users wanting a more permanent housing, Baader also provides STL files so you can 3D print a plastic version yourself.\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\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.17\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003eT-2 (M42)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar Wavelength\u003c\/td\u003e\n\u003ctd\u003eWhitelight (integral light)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar Filter with mount\/thread?\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Backfocus\u003c\/td\u003e\n\u003ctd\u003e30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Solar_Projection_Screen_BSPS_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Solar Projection Screen BSPS Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Solar_Projection_Screen_BSPS_Building_Instructions.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Solar Projection Screen BSPS Building Instructions\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913271636253,"sku":"BAA-2420400","price":59.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-Baader-Solar-Projection-Screen-BSPS-1_62f75401-f289-464b-b58a-29007b43ef6f.jpg?v=1789088930","url":"https:\/\/davidastro.com\/en-us\/products\/baader-planetarium-solar-projection-screen-bsps","provider":"David Astro","version":"1.0","type":"link"}