{"product_id":"baader-planetarium-2-inch-bbhs-mirror-adjustable-star-diagonal","title":"Baader Planetarium 2\" BBHS® Mirror – Adjustable Star Diagonal","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBBHS® Broad Band Hard Silver coating for maximum spectral range and color fidelity\u003c\/li\u003e\n\u003cli\u003eUser-collimatable mirror in a CNC-machined aluminum housing\u003c\/li\u003e\n\u003cli\u003eThermally stable, zero-expansion glass-ceramic substrate\u003c\/li\u003e\n\u003cli\u003eBaader 2\" ClickLock eyepiece clamp for secure, self-centering grip\u003c\/li\u003e\n\u003cli\u003eIntegrated threads for modular, torsion-free accessory connection\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 Planetarium 2\" BBHS® Mirror – Adjustable Star Diagonal\u003c\/h2\u003e\n\u003cp\u003eThe Baader 2\" BBHS® Adjustable Star Diagonal combines a broad-spectrum, hard-silver mirror coating with a user-collimatable, thermally stable glass-ceramic substrate. This design delivers exceptional color fidelity and contrast, supported by the secure, self-centering 2\" ClickLock clamp and a CNC-machined housing ready for modular system integration.\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\u003eThe 2\" BBHS® Advantage: A Broad-Spectrum Hard Silver Coating\u003c\/h3\u003e\n\u003cp\u003eUnlike conventional dielectric coatings that reflect a limited portion of the visible spectrum, Baader's Broad Band Hard Silver (BBHS®) coating provides extremely high reflectivity across a vast spectral range from the near-UV well into the infrared. This hard-sealed silver layer is protected against the tarnishing that plagues simpler silver mirrors, ensuring long-term durability comparable to a primary telescope mirror.\u003c\/p\u003e\n\u003cp\u003eThe result for an observer is a view with noticeably richer colors and superior brilliance, free from the stray light that can soften contrast in other designs. For planetary observers using high-end APO refractors, the increase in color saturation and intensity is immediately apparent compared to diagonals with standard coatings.\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\u003ePrecision Mechanics: A Collimatable 2\" Glass-Ceramic Mirror Cell\u003c\/h3\u003e\n\u003cp\u003eThe BBHS® mirror is fabricated on a glass-ceramic substrate, a material with minimal thermal expansion. This ensures the mirror holds its precise figure for stable, sharp images even as ambient temperatures change. The mirror itself rests stress-free in an adjustable cradle within the CNC-machined aluminum housing.\u003c\/p\u003e\n\u003cp\u003eThis unique construction allows you to collimate the diagonal, just like a high-quality refractor objective. While factory-aligned to exacting standards, this adjustability is critical for advanced applications like constructing binocular telescopes or perfecting the optical alignment of an entire imaging train. Note that user adjustment voids the factory collimation warranty, though all other coverage remains.\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\u003eThe 2\" ClickLock System: Secure, 3-Point Self-Centering Clamping\u003c\/h3\u003e\n\u003cp\u003eBaader's acclaimed 2\" ClickLock eyepiece clamp secures even the heaviest accessories with a simple, light twist of the outer ring. This mechanism engages a three-point clamp that grips the barrel firmly and evenly, automatically centering the eyepiece or camera on the optical axis and preventing any tilting or slop.\u003c\/p\u003e\n\u003cp\u003eBeyond the clamp, the diagonal is a core component of Baader's modular accessory system. It features threads for direct, torsion-free connection to Baader focusers and other components. It also includes a clever provision for seating a 2\" filter inside the telescope-side nosepiece, keeping it safe from dust while leaving the external threads free for other uses.\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\u003eBBHS® Mirror vs. Dielectric Diagonal: A Visible Difference in Color\u003c\/h3\u003e\n\u003cp\u003eWhile robust, dielectric mirror coatings typically have high reflectivity only within the 400nm to 700nm range of human vision, cutting off light at either end. The BBHS® silver coating extends this range significantly, maintaining its reflectivity at varying angles and across a much wider band.\u003c\/p\u003e\n\u003cp\u003eThis isn't just a number on a chart; it translates to a tangible improvement at the eyepiece. You see a more complete and accurate color palette, revealing subtle hues on planetary surfaces and in stars that are lost by spectrally-limited coatings. For fast optical systems (below f\/7), a high-quality mirror diagonal like the BBHS® is consistently preferable to a prism for maintaining image sharpness and contrast.\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\"\u003eWhat makes the Baader 2\" BBHS® diagonal different from a standard dielectric diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key difference is the \u003cstrong\u003ecoating technology\u003c\/strong\u003e. Standard dielectric diagonals reflect a limited slice of the visible spectrum, which can subtly alter color balance. The Baader BBHS® (Broad Band Hard Silver) diagonal uses a protected silver coating that reflects a much wider spectrum of light, resulting in more accurate, vibrant colors and higher overall image brilliance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I choose this BBHS® mirror diagonal over a prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAs a general rule, mirror diagonals are recommended for telescopes with \u003cstrong\u003efast focal ratios (typically f\/7 or faster)\u003c\/strong\u003e. In these systems, a mirror like the BBHS® maintains higher image quality and avoids introducing the optical aberrations that a prism can in a converging light cone. Prisms are often preferred for slower instruments (f\/8 and above).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I adjust the collimation of the 2\" BBHS® mirror diagonal myself?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the mirror is mounted in an adjustable cell, allowing for precise collimation. This is a powerful feature for advanced users who need to ensure perfect alignment in their optical train. However, please be aware that \u003cstrong\u003ealtering the factory settings will void the warranty on the factory collimation\u003c\/strong\u003e, though the product's overall warranty remains intact.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 2\" ClickLock clamp on the BBHS® diagonal work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader ClickLock clamp is a premium alternative to simple thumbscrews. A gentle twist of the rubberized collar engages a three-point clamping system that holds your eyepiece or camera securely and perfectly centered on the optical axis. It provides a very strong, non-marring grip and eliminates the possibility of your accessories tilting in the focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader 2\" BBHS® diagonal improve views of Jupiter through my f\/5 APO refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a fast, high-contrast telescope like an f\/5 APO, the BBHS® diagonal provides two main benefits for viewing Jupiter. First, its broad spectral reflection ensures you see the planet's cloud bands with \u003cstrong\u003emaximum color fidelity\u003c\/strong\u003e, revealing subtle reds, browns, and tans that a dielectric might suppress. Second, the complete absence of stray light from the silver coating results in \u003cstrong\u003ehigher contrast\u003c\/strong\u003e, making it easier to resolve fine details like small ovals and festoons within the zones and belts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the BBHS® diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Baader 2\" BBHS® diagonal is designed with filter use in mind. You can thread a 2\" filter onto the telescope-side barrel as with any diagonal. Uniquely, you can also permanently install a 2\" filter on the eyepiece-side of the 2\" nose-piece, where it can serve as a dust protector for the mirror while leaving the primary filter threads available for other uses.\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\u003e0.54\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eClickLock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e47\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e112\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm), M55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM48, 2\"\/SCT Thread (50.8mm), M55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm), S58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eBBHS coated\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_Star_Diagonals_T-2_and_2in_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 Star Diagonals T-2 and 2in Manual\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":52913119691037,"sku":"BAA-2456105","price":579.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-2-BBHS-Mirror-Adjustable-Star-Diagonal-1_e7869b5b-23c4-46c2-b36f-aa54d284616e.jpg?v=1789086442","url":"https:\/\/davidastro.com\/en-us\/products\/baader-planetarium-2-inch-bbhs-mirror-adjustable-star-diagonal","provider":"David Astro","version":"1.0","type":"link"}