{"title":"Baader SolarSpectrum Solar Telecompressors","description":"\u003cp\u003eBaader SolarSpectrum telecompressors reduce the image scale at the end of a solar imaging train, so more of the solar disc fits on the camera sensor. They are intended for use behind narrowband solar filter systems that work with a long, telecentric light path.\u003c\/p\u003e\u003cp\u003eTwo 2\" versions are available: a 0.7x telecompressor for moderate reduction, and a Research Grade 0.4x model for wider solar fields with smaller sensors.\u003c\/p\u003e","products":[{"product_id":"baader-solarspectrum-0-7x-telecompressor-2","title":"Baader SolarSpectrum 0.7x Telecompressor - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.7x Focal Reduction Factor\u003c\/li\u003e\n\u003cli\u003eDesigned for SolarSpectrum H-alpha Filters\u003c\/li\u003e\n\u003cli\u003eCorrects for f\/30 Telecentric Systems\u003c\/li\u003e\n\u003cli\u003e2\" Barrel and Threading\u003c\/li\u003e\n\u003cli\u003eEnables Full-Disk Solar Views\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 SolarSpectrum 0.7x Telecompressor - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader SolarSpectrum 0.7x Telecompressor is an essential 2\" accessory for any SolarSpectrum H-alpha filter owner, specifically designed to solve the challenge of the required f\/30 light cone. This reducer shortens your telescope's effective focal length by a factor of 0.7x, ensuring the full solar disk and its surrounding prominences fit within the field of view of eyepieces in the 30mm to 35mm range.\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 f\/30 Requirement: Why SolarSpectrum Filters Need This Compressor\u003c\/h3\u003e\n\u003cp\u003eSolarSpectrum H-alpha filters mandate a parallel light path of at least f\/30 to achieve their narrow bandpass. This is typically accomplished using a telecentric system, which dramatically increases the telescope's effective focal length. The consequence is a highly magnified image where the full solar disk no longer fits in the field of view, even with long-focal-length eyepieces of 30mm to 35mm.\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 0.7x Reduction: Framing the Full Solar Disk and Prominences\u003c\/h3\u003e\n\u003cp\u003eThis telecompressor mounts on the eyepiece side of the filter, reducing the elongated focal length by a factor of 0.7x to bring the entire sun back into view. For example, a 6\" refractor operating at an effective focal length of 2250mm (at f\/30) is reduced to approximately 1700mm, restoring a full-disk perspective. For imagers, this reduction also provides the dual benefit of a wider field for framing and shorter necessary exposure times, helping to freeze atmospheric turbulence.\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\u003eMechanical Mounting: Integrating with the 2\" Universal Flange\u003c\/h3\u003e\n\u003cp\u003eIntegration into your optical train is straightforward. The telecompressor is designed to thread into the Baader 2\" Universal Flange (#2958240, sold separately), which attaches directly to the SolarSpectrum filter housing with four screws. The compressor features a standard 2\" male thread and is fully compatible with Baader's T-2 accessory system, allowing for secure, threaded connections to cameras, T-2 prisms, or eyepiece holders.\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\u003eChoosing Your Reduction: 0.7x vs. the 0.4x Telecompressor\u003c\/h3\u003e\n\u003cp\u003eBaader offers two options to suit different equipment and goals. The 0.7x Telecompressor provides a moderate reduction that is ideal for most telescope systems to perfectly frame the sun and its prominences. For those with shorter focal length instruments or imagers seeking the widest possible field of view, the more aggressive 0.4x Telecompressor (#2459260) is also available.\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\"\u003eWhy is a telecompressor needed for my Baader SolarSpectrum filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSolarSpectrum H-alpha filters require a very slow, parallel f\/30 light cone for optimal performance. This is achieved with a telecentric system, which significantly increases your telescope's effective focal length. The 0.7x Telecompressor reduces this focal length back down, allowing the entire solar disk to fit within a typical eyepiece field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader 0.7x Telecompressor physically attach to the filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt attaches to the eyepiece-side of the SolarSpectrum filter housing. You will need the \u003cstrong\u003eBaader 2\" Universal Flange\u003c\/strong\u003e (sold separately, #2958240), which secures to the filter with four screws. The telecompressor's 2\" male thread then screws directly into the flange.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader 0.7x Telecompressor for solar imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is highly recommended for imaging. By reducing the effective focal length by a factor of 0.7x, it not only provides a wider field of view to capture the full sun but also significantly reduces the required exposure times, which helps freeze atmospheric seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I choose the Baader 0.7x Telecompressor versus the 0.4x model?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e0.7x Telecompressor\u003c\/strong\u003e provides a moderate reduction that is ideal for most telescopes to frame the full sun and prominences. The \u003cstrong\u003e0.4x Telecompressor\u003c\/strong\u003e offers a more aggressive reduction for an even wider field of view, which may be preferable for shorter focal length telescopes or for imagers who need to fit the sun into a smaller sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy refractor has a 2250mm focal length after adding the telecentric. Will the 0.7x Telecompressor let me see the full solar disk?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the exact scenario it's designed for. The 0.7x telecompressor will reduce that 2250mm effective focal length to approximately 1700mm, which is short enough to frame the entire sun and its prominences when using a wide-field eyepiece around 30-35mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I connect my T-2 accessories to the Baader 0.7x Telecompressor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While the telecompressor has a native 2\" male thread, it is fully compatible with the Baader T-2 accessory system. You can use various T-2 adapters to change the output to a male or female T-2 thread for securely connecting cameras, prisms, or other components.\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\u003e0.10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar Filter with mount\/thread?\u003c\/td\u003e\n\u003ctd\u003eNo\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_D-ERF_Filter_Safe_Use_Notes.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 D-ERF Filter Safe Use Notes\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_SolarSpectrum_Heated_H-alpha_Filters_Product_Information.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 Heated H-alpha Filters Product Information\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":44967380713757,"sku":"BAA-2459259","price":456.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-SolarSpectrum-0-7x-Telecompressor-2-inch-1__72390.1597111111.1280.1280.jpg?v=1684341706"},{"product_id":"baader-solarspectrum-research-grade-0-4x-telecompressor-2","title":"Baader SolarSpectrum Research Grade 0.4x Telecompressor - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces effective focal ratio by a factor of 0.4x\u003c\/li\u003e\n\u003cli\u003eDesigned for Baader Solar Spectrum filters requiring an f\/30 light path\u003c\/li\u003e\n\u003cli\u003eEnables viewing of the full solar disk in a single field\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch barrel and 2-inch male filter threads\u003c\/li\u003e\n\u003cli\u003eAdaptable to the T-2 accessory system\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 SolarSpectrum Research Grade 0.4x Telecompressor - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader SolarSpectrum Research Grade 0.4x Telecompressor is an essential optical component designed to solve the primary challenge of high-magnification solar observation: fitting the entire sun in your eyepiece. Specifically engineered for Solar Spectrum H-alpha filters, which require a slow f\/30 light path, this 2-inch telecompressor reduces your telescope's effective focal length by a factor of 0.4x. This aggressive reduction transforms a narrow, high-power view into a complete portrait of the sun, making the full disk and surrounding prominences visible in eyepieces with focal lengths from 30mm to 35mm.\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\u003eCapture the Full Solar Disk: A 0.4x Focal Reduction for f\/30 Systems\u003c\/h3\u003e\n\u003cp\u003eBaader's Solar Spectrum H-alpha filters achieve their ultra-narrow bandpass by operating within a parallel light beam, typically created by a telecentric system that extends a telescope's focal ratio to f\/30. While optically necessary, this long effective focal length often results in a field of view too small to contain the entire solar disk. The 0.4x Telecompressor directly corrects this by converting the f\/30 beam to an effective f\/12, dramatically widening your field of view and ensuring you can frame the sun in its entirety.\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\u003e2-Inch Format for H-alpha Imaging: Wider Fields and Shorter Exposures\u003c\/h3\u003e\n\u003cp\u003eFor solar imagers, the benefits of the 0.4x telecompressor are twofold. By widening the field, it allows webcams and planetary cameras with smaller sensors to capture the full solar disk in a single frame, eliminating the need for complex mosaics. Furthermore, the f-ratio reduction significantly increases image brightness, which in turn reduces the required exposure times—a critical factor for freezing atmospheric turbulence and achieving sharper images of solar granulation and filamentary detail.\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\u003eSeamless Integration with 2-Inch and T-2 Threads\u003c\/h3\u003e\n\u003cp\u003eThis telecompressor is designed for direct, secure attachment to the rear of a Solar Spectrum filter housing. It threads into the Baader 2″ Universal Flange (sold separately, #2958240), which attaches to the filter body with four screws. The telecompressor features a standard 2-inch male thread, and its optical path can be adapted using Baader's extensive T-2 accessory system, allowing for rigid, threaded connections to diagonals, extension tubes, and cameras for a flexure-free imaging train.\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\u003eChoosing Your Reduction: Baader 0.4x vs. the 0.7x Telecompressor\u003c\/h3\u003e\n\u003cp\u003eBaader offers two telecompressors for the Solar Spectrum line, and the choice depends on your specific goals. The 0.7x version provides a more moderate focal reduction, making it ideal for observers who want a wider field but also wish to maintain a larger image scale for detailed views of active regions, flares, and prominences.\u003c\/p\u003e\n\u003cp\u003eThe 0.4x telecompressor, in contrast, offers the maximum possible field of view. It is the definitive choice for imagers wanting to capture full-disk portraits, for visual observers using long focal length telescopes, or for anyone operating under seeing conditions that don't support very high magnification. If your primary goal is to see the entire solar disk at once, the 0.4x is the correct tool.\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 is the primary purpose of the Baader 0.4x Telecompressor for Solar Spectrum filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts main purpose is to reduce the long f\/30 effective focal length required by Solar Spectrum H-alpha filters. This \u003cstrong\u003e0.4x reduction\u003c\/strong\u003e widens the field of view, allowing you to see the entire solar disk in a single view, which is often impossible at the native f\/30 focal ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the Baader 0.4x Telecompressor to my Solar Spectrum filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe telecompressor is not attached directly to the filter. You must first install the \u003cstrong\u003eBaader 2″ Universal Flange (#2958240)\u003c\/strong\u003e onto the rear of the filter housing using four screws. The telecompressor then threads directly into the 2-inch female thread of the universal flange.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I choose the 0.4x Telecompressor over the 0.7x version for my Solar Spectrum filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the \u003cstrong\u003e0.4x Telecompressor\u003c\/strong\u003e when your primary goal is achieving the widest possible field of view, especially for full-disk solar imaging or when using a very long focal length telescope. Choose the \u003cstrong\u003e0.7x version\u003c\/strong\u003e if you want a wider field than native f\/30 but prefer to maintain a larger image scale for detailed views of specific solar features like sunspots or prominences.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm using a 6-inch f\/15 refractor with a Solar Spectrum filter, making it f\/30. Will the 0.4x Telecompressor let me see the full sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. An f\/30 system is exactly what this telecompressor is designed for. Applying the 0.4x reduction factor will change your effective focal ratio to f\/12. This significant reduction will provide a field of view wide enough to easily frame the entire solar disk with most Plössl or wide-field eyepieces in the 30-35mm range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader 0.4x Telecompressor improve imaging the full solar disk with a webcam?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt improves imaging in two key ways. First, it shrinks the image scale so the entire sun fits onto the smaller sensor of a typical planetary camera or webcam. Second, by reducing the focal ratio from f\/30 to f\/12, it makes the image much brighter, allowing for \u003cstrong\u003eshorter exposure times\u003c\/strong\u003e which are critical for \"lucky imaging\" and freezing atmospheric turbulence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I connect T-2 accessories to the Baader 0.4x Telecompressor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While the telecompressor itself has 2-inch threads, it is designed to be fully compatible with the Baader Astro \u003cstrong\u003eT-2 system\u003c\/strong\u003e. You can use various T-2 adapters to create a solid, threaded connection to your camera, flip mirror, or other accessories for a rigid imaging setup.\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\u003eFocal Reduction\u003c\/td\u003e\n\u003ctd\u003e0.4x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003e2\" Male (SD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Application\u003c\/td\u003e\n\u003ctd\u003eBaader Solar Spectrum H-alpha filters at f\/30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaader Part Number\u003c\/td\u003e\n\u003ctd\u003e2459260\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.08\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar Filter with mount\/thread?\u003c\/td\u003e\n\u003ctd\u003eNo\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_D-ERF_Filter_Safe_Use_Notes.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 D-ERF Filter Safe Use Notes\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_SolarSpectrum_Heated_H-alpha_Filters_Product_Information.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 Heated H-alpha Filters Product Information\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":44967380779293,"sku":"BAA-2459260","price":533.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-SolarSpectrum-Research-Grade-0-4x-Telecompressor-2-inch-1__79716.1597111112.1280.1280.jpg?v=1684341713"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/baader-solarspectrum-solar-telecompressors.oembed","provider":"David Astro","version":"1.0","type":"link"}