{"product_id":"tele-vue-set-of-6-2-4-inch-accessory-tubes","title":"Tele Vue Set of 6x 2.4\" Accessory Tubes","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAchieve Precise Back Focus for Tele Vue Imaging Systems\u003c\/li\u003e\n\u003cli\u003eIncludes Four Threaded Extension Tubes (6.4mm, 9.5mm, 12.7mm, 25.4mm)\u003c\/li\u003e\n\u003cli\u003eIncludes Two Unthreaded Spacers for Fine-Tuning (1mm, 2mm)\u003c\/li\u003e\n\u003cli\u003eCompatible with 2.4\" Tele Vue Focusers (NP101is, NP127is)\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Aluminum with Anti-Reflection Threads\u003c\/li\u003e\n\u003cli\u003eEnables Stacking for Custom Spacing Combinations\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\u003eManuals\/Downloads\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\u003ePrecision Spacing for Flawless Astrophotos\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Set of 6 2.4\" Accessory Tubes is an essential toolkit for astrophotographers using Tele Vue's large-format \"is\" refractors, providing the mechanical precision required to achieve perfect back focus. This comprehensive set allows you to rigidly and accurately set the distance between your reducer, flattener, or corrector and your camera sensor. Getting this distance right is not just a recommendation, it is a fundamental requirement for achieving sharp, coma-free stars across the entire photographic field.\u003c\/p\u003e\n\u003cp\u003eModern correctors and reducers are designed with a specific, optimal back-focus distance, often 55mm, but this can vary. This set gives you the modular components to bridge the gap between your camera's native back focus and the optical requirement of your imaging train. By combining threaded tubes for major adjustments and unthreaded shims for fine-tuning, you can build the exact spacing your system needs, down to the millimeter, eliminating a critical source of image degradation.\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\u003eFour Threaded Extension Tubes for Secure Connections\u003c\/h3\u003e\n\u003cp\u003eThe core of the set consists of four threaded extension tubes, providing 6.4mm (0.25\"), 9.5mm (0.375\"), 12.7mm (0.50\"), and 25.4mm (1.0\") of spacing. Each tube features the robust Tele Vue 2.4\" imaging system thread on both male and female ends. This ensures a secure, tilt-free connection that maintains the rigidity of your imaging train, which is critical when supporting heavy cameras and filter wheels.\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\u003eTwo Unthreaded Spacers for Millimeter-Level Accuracy\u003c\/h3\u003e\n\u003cp\u003eWhen your required spacing falls between the lengths of the threaded tubes, the two included unthreaded spacers provide the solution. The 1mm and 2mm shims are designed to be placed between any two threaded components, allowing you to dial in your back focus with high precision. This fine control is often the difference between good edge-of-field star shapes and perfect ones.\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\u003eDurable and Lightweight Aluminum Construction\u003c\/h3\u003e\n\u003cp\u003eEvery component in the set is machined from black anodized aluminum. This material provides an excellent balance of strength and low weight, ensuring your focuser is not overburdened. The anodized finish adds a layer of durability and corrosion resistance, protecting your investment for years of use in the field.\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\u003eAnti-Reflection Threads to Maximize Contrast\u003c\/h3\u003e\n\u003cp\u003eTo preserve the high contrast delivered by Tele Vue optics, the interior of the threaded extension tubes features micro-baffles. These anti-reflection threads are designed to trap any stray light that might enter the optical path. This small but critical detail prevents internal reflections from scattering light and reducing the contrast of your final image, ensuring deep black skies and faint details are not washed out.\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\u003eDesigned for the Tele Vue 2.4\" Imaging System\u003c\/h3\u003e\n\u003cp\u003eThis set is specifically engineered for the large-format focusers found on Tele Vue NP101is and NP127is refractors. These telescopes, designed for wide-field imaging with large sensors, have a 2.4\" diameter drawtube exit to minimize vignetting. This accessory tube set integrates perfectly, maintaining the full, unvignetted light path from the corrector to your camera sensor.\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\u003eModular Design for Ultimate Versatility\u003c\/h3\u003e\n\u003cp\u003eThe true power of this set is its modularity. The six different lengths can be stacked in various combinations to create dozens of unique spacing distances. Whether you are using a Tele Vue 0.8x reducer, a Large Field Corrector, or third-party accessories, this kit provides the flexibility to adapt to nearly any back-focus requirement you encounter, making it a permanent and indispensable part of your imaging toolkit.\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\u003eAn Essential Tool for Serious Imagers\u003c\/h3\u003e\n\u003cp\u003eWhile it may seem like a simple set of tubes, achieving correct back focus is a non-negotiable part of serious astrophotography. A small error in spacing can introduce significant aberrations, wasting precious imaging time. The Tele Vue Set of 6 Accessory Tubes is the professional solution, providing a reliable, repeatable, and precise method for optimizing your optical system for the best possible performance.\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 main purpose of the Tele Vue 2.4\" Accessory Tube Set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis set allows astrophotographers to precisely adjust the back-focus distance between their camera sensor and a field flattener or reducer. Achieving the correct spacing, often 55mm, is critical for obtaining sharp, coma-free stars across the entire image field with Tele Vue \"is\" refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill these tubes work with a standard 2\" focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, these tubes use Tele Vue's specific 2.4\" imaging system thread. They are designed for the larger focusers on NP101is, NP127is, and other \"is\" series telescopes to prevent vignetting with large camera sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the unthreaded 1mm and 2mm spacers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe unthreaded spacers are used for fine-tuning. You simply sandwich them between two of the threaded extension tubes or between an extension tube and your camera adapter. The pressure from tightening the threaded components holds the spacer securely in place.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack multiple tubes together?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the tubes are designed to be stacked. You can combine multiple threaded tubes and spacers to build the exact length required by your specific camera and corrector combination, offering a high degree of modularity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are anti-reflection threads important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe internal threads act as light baffles, trapping stray light that could otherwise cause internal reflections within the imaging train. This helps to maintain maximum image contrast, resulting in darker sky backgrounds and more visible faint detail in your astrophotos.\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\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eTele Vue 2.4\" Imaging System Focusers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003eTele Vue 2.4\" Imaging System Thread (2.56\"-24tpi nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreaded Tube Lengths\u003c\/td\u003e\n\u003ctd\u003e6.4mm (0.25\"), 9.5mm (0.375\"), 12.7mm (0.50\"), 25.4mm (1.0\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnthreaded Spacer Thicknesses\u003c\/td\u003e\n\u003ctd\u003e1mm (0.040\"), 2mm (0.080\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Components\u003c\/td\u003e\n\u003ctd\u003e6\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e25.4mm (1.0\") Threaded Extension Tube (TLD-1000)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e12.7mm (0.50\") Threaded Extension Tube (TLC-0500)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9.5mm (0.375\") Threaded Extension Tube (TLB-0375)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e6.4mm (0.25\") Threaded Extension Tube (TLA-0250)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2mm (0.080\") Unthreaded Spacer (TLG-0080)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1mm (0.040\") Unthreaded Spacer (TLF-0040)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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\/Tele_Vue_Tubes_and_Spacers_Set_2.4-inch_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\"\u003eDownload 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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223884988701,"sku":"TV-TLS-2245","price":218.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Set_of_6_2.4in_Accessory_Tubes_1.jpg?v=1777515030","url":"https:\/\/davidastro.com\/fr\/products\/tele-vue-set-of-6-2-4-inch-accessory-tubes","provider":"David Astro","version":"1.0","type":"link"}