{"product_id":"baader-planetarium-tz-4s-telecentric-system-t-2-for-sundancer-ii-and-more","title":"Baader Planetarium TZ-4S Telecentric System T-2 for SunDancer II and more","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCreates a parallel beam of light required for H-alpha solar filters\u003c\/li\u003e\n\u003cli\u003eHigher magnification factor for using solar filters on faster telescopes\u003c\/li\u003e\n\u003cli\u003eMaintains a constant magnification factor regardless of working distance\u003c\/li\u003e\n\u003cli\u003eConnects via a standard T-2 thread and a dual 1.25\"\/2\" nosepiece\u003c\/li\u003e\n\u003cli\u003ePreserves the native eye relief of visual eyepieces\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\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\u003eTZ-4S Telecentric System T-2 for SunDancer II and more\u003c\/h2\u003e\n      \u003cp\u003eThe Baader TZ-4S Telecentric System is engineered to produce a perfectly parallel beam of light, an essential requirement for the etalon in any high-resolution H-alpha solar filter like the SunDancer II. It connects to your camera or eyepiece holder via a rigid T-2 thread and fits any telescope focuser with its dual 1.25\" and 2\" nosepiece.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eA Parallel Light Path for Uncompromised H-alpha Contrast\u003c\/h3\u003e\n      \u003cp\u003eFor H-alpha filters with a narrow half-bandwidth, a telecentric optical system is mandatory. Standard Barlow lenses or focal extenders create a converging light cone, which degrades the filter's performance and significantly reduces contrast. The TZ-4S ensures the light rays are perfectly parallel across the entire field before they enter the etalon, allowing the filter to operate at its maximum theoretical contrast and reveal the finest solar details.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eHigh-Magnification Viewing Without Barlow Lens Drawbacks\u003c\/h3\u003e\n      \u003cp\u003eBeyond solar applications, the TZ-4S serves as a superior alternative to a Barlow lens for high-magnification visual observation of the planets. Unlike a Barlow, whose magnification changes with distance, a telecentric system maintains its specified magnification factor and optical quality regardless of the spacing to the eyepiece or camera. This design also preserves the original eye relief of your eyepiece, ensuring comfortable views even at high power.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eAdapting the SunDancer II for Shorter Focal Ratio Telescopes\u003c\/h3\u003e\n      \u003cp\u003eThe TZ-4S is the key to using the Baader SunDancer II H-alpha filter on telescopes with shorter native focal ratios, such as f\/7 or f\/8 apochromatic refractors. It provides the necessary magnification to convert the telescope's light cone into the slow, parallel beam required by the SunDancer's etalon. This allows owners of faster instruments to achieve the same stunning solar views as those with longer-focal-length telescopes.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCritical User Note:\u003c\/strong\u003e To use the TZ-4S with a SunDancer II filter, you must transfer the 2nm blocking filter from the original 3x telecentric (TZ-3S) supplied with your SunDancer. The blocking filter is not included with the TZ-4S and is not available for separate purchase.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSecure Connections with a 1.25\"\/2\" Nosepiece and T-2 Thread\u003c\/h3\u003e\n      \u003cp\u003eThe TZ-4S is built for a secure, tilt-proof fit in any imaging train. The telescope side features a dual-format nosepiece that fits both 1.25\" and 2\" focusers, machined with safety kerfs for a secure grip without marring the barrel. The camera side features a standard T-2 (M42x0.75) male thread, providing a rigid, direct connection to cameras, filter wheels, or T-2 eyepiece clamps, eliminating the potential for flexure that can plague slip-fit adapters.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eTZ-4S vs. TZ-3S: Choosing the Right Telecentric Magnification\u003c\/h3\u003e\n      \u003cp\u003eThe primary difference between the TZ-4S and the TZ-3S included with the SunDancer II filter lies in their intended telescope pairing. Each is designed to produce the optimal final focal ratio for the H-alpha etalon.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eBaader TZ-3S (Standard):\u003c\/strong\u003e This telecentric is optimized for telescopes with longer native focal ratios, such as f\/10 Schmidt-Cassegrains. It provides the correct magnification to condition the beam for the SunDancer II etalon.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eBaader TZ-4S (This Product):\u003c\/strong\u003e With its higher magnification, the TZ-4S is designed for telescopes with faster native focal ratios, such as f\/7.5 refractors. It allows these instruments to achieve the same ideal parallel beam, making it the essential upgrade for wide-field telescope owners wanting to perform high-resolution solar imaging.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Baader TZ-4S Telecentric System necessary for H-alpha solar filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNarrow-band H-alpha filters, like the Baader SunDancer II, contain an etalon that only performs correctly when fed a \u003cstrong\u003eperfectly parallel beam of light\u003c\/strong\u003e. A standard Barlow lens or the telescope's native focal ratio creates a converging cone of light, which significantly degrades the filter's contrast. The TZ-4S is an optical conditioner that creates this necessary parallel beam, unlocking the filter's full performance.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the TZ-4S different from a standard Barlow lens for viewing Jupiter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe TZ-4S offers two main advantages for planetary viewing. First, its magnification factor is \u003cstrong\u003econstant and independent of distance\u003c\/strong\u003e, unlike a Barlow which changes magnification as you move the eyepiece. Second, the TZ-4S \u003cstrong\u003epreserves the eyepiece's native eye relief\u003c\/strong\u003e, making high-power viewing much more comfortable, especially for eyeglass wearers.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the TZ-4S with my SunDancer II H-alpha filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, but with a critical requirement. You \u003cstrong\u003emust carefully remove the 2nm H-alpha blocking filter\u003c\/strong\u003e from the front of the TZ-3S telecentric that came with your SunDancer II and install it into the TZ-4S. The TZ-4S does not include this filter, and it cannot be purchased separately. This component is essential for the safe and correct operation of the H-alpha system.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of telescope is the TZ-4S designed for when used with the SunDancer II?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe TZ-4S is designed for telescopes with \u003cstrong\u003eshorter native focal ratios, typically in the f\/7 to f\/8 range\u003c\/strong\u003e, such as apochromatic refractors. The standard TZ-3S is better suited for longer focal ratio instruments like f\/10 Schmidt-Cassegrains. The TZ-4S provides the higher magnification needed for faster scopes to achieve the ideal slow focal ratio for the etalon.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the connection options on the TZ-4S Telecentric System?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe TZ-4S offers flexible and secure connections:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTelescope Side:\u003c\/strong\u003e A dual-purpose nosepiece that fits into both \u003cstrong\u003e1.25\" and 2\" focusers\u003c\/strong\u003e.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eCamera\/Eyepiece Side:\u003c\/strong\u003e A standard male \u003cstrong\u003eT-2 (M42x0.75) thread\u003c\/strong\u003e for a rigid, threaded connection to your camera or other T-2 accessories.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the TZ-4S change the eye relief of my eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. A key benefit of the telecentric design is that it \u003cstrong\u003epreserves the original eye relief\u003c\/strong\u003e of any eyepiece you use with it. This is a significant comfort advantage over some other magnification methods, especially during long planetary observing sessions.\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\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsage\u003c\/td\u003e\n\u003ctd\u003efor H-alpha observation with SolarSpectrum filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length extension\u003c\/td\u003e\n\u003ctd\u003e4x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm), ø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Field\u003c\/td\u003e\n\u003ctd\u003e36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\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_SolarSpectrum_H-alpha_Filter_Telecentric_Systems_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 SolarSpectrum H-alpha Filter Telecentric Systems 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_SunDancer_II_Blocking_Filter_TZ-3S_to_TZ-4S_Guide.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 SunDancer II Blocking Filter TZ-3S to TZ-4S Guide\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_SunDancer_II_H-alpha_Filter_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 SunDancer II H-alpha Filter 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_SunDancer_II_Telecentric_System_TZ-4S_Technical_Drawing.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 SunDancer II Telecentric System TZ-4S Technical Drawing\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\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":52913280319773,"sku":"BAA-1363080","price":481.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-TZ-4S-Telecentric-System-T-2-for-SunDancer-II-and-more-1_13355d0b-dfeb-4b78-9327-55b02e730c7b.jpg?v=1789089040","url":"https:\/\/davidastro.com\/en-us\/products\/baader-planetarium-tz-4s-telecentric-system-t-2-for-sundancer-ii-and-more","provider":"David Astro","version":"1.0","type":"link"}