{"product_id":"starlight-instruments-3-5-end-cap-collet-style-w-2-0-opening","title":"Starlight Instruments 3.5\" End Cap Collet Style w\/ 2.0\" Opening","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFits all Starlight Instruments 3.5\" Feather Touch focusers\u003c\/li\u003e\n\u003cli\u003eProvides a secure 2.0\" opening for accessories\u003c\/li\u003e\n\u003cli\u003eCollet-style clamp ensures perfect centering and prevents tilt\u003c\/li\u003e\n\u003cli\u003eMachined from high-quality aluminum to match the focuser\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\u003eStarlight Instruments 3.5\" End Cap Collet Style w\/ 2.0\" Opening\u003c\/h2\u003e\n\u003cp\u003eThe Starlight Instruments 3.5\" Collet Style End Cap provides an exceptionally secure, centered connection for all your 2.0\" accessories. Designed specifically for the Feather Touch 3.5\" focuser series, this end cap replaces the standard compression ring to deliver a positive, non-marring grip that is ideal for heavy imaging trains and critical visual work.\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 Secure 2.0\" Collet End Cap for 3.5\" Feather Touch Focusers\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard compression ring that relies on one or two thumbscrews to apply pressure, this collet-style end cap utilizes a threaded locking ring. As you tighten the ring, it evenly compresses a split sleeve around the entire circumference of your 2.0\" eyepiece or camera nosepiece.\u003c\/p\u003e\n\u003cp\u003eThis 360-degree grip ensures perfect centering of the optical axis and eliminates any possibility of tilt, a critical factor for maintaining a flat field in demanding imaging applications. Machined from high-quality aluminum with the same precision as the focusers themselves, it provides a seamless fit and finish for your 3.5\" Feather Touch system.\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 does the Starlight 3.5\" Collet End Cap differ from the standard compression ring?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Collet End Cap provides a more secure and precisely centered grip. Instead of applying pressure at one or two points, it compresses a sleeve evenly around the entire accessory barrel.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e360-Degree Contact:\u003c\/strong\u003e Ensures your camera or eyepiece is perfectly aligned with the optical axis, eliminating tilt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Holding Power:\u003c\/strong\u003e Ideal for heavy imaging trains, preventing any sag or flexure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-Marring Grip:\u003c\/strong\u003e Safely secures accessory barrels without leaving marks from thumbscrews.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Starlight 3.5\" Collet End Cap necessary for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile not strictly necessary for all visual use, it is highly recommended for observers using heavy, premium 2.0\" eyepieces. The secure, centered grip prevents the eyepiece from sagging and maintains the best possible optical alignment for sharp, high-contrast views across the entire field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Starlight 2.0\" Collet End Cap fit focusers other than the 3.5\" Feather Touch?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This end cap is specifically machined and threaded to fit the drawtube of the Starlight Instruments 3.5\" Feather Touch focuser series only. It is not compatible with other brands or other sizes of Feather Touch focusers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the Starlight 3.5\" Collet End Cap on my focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation is straightforward. Simply unthread the existing end cap from the focuser drawtube by turning it counter-clockwise, and then thread the new collet end cap on in its place until it is snug. No tools are required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm imaging with a heavy camera on my 3.5\" Feather Touch focuser. Will the Starlight Collet End Cap prevent flexure?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is precisely the application where the collet end cap excels. Its uniform, 360-degree grip provides a significantly more rigid connection than a standard compression ring, minimizing the risk of tilt or flexure even with heavy and off-balance imaging trains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen using a Tele Vue Paracorr Type 2 with my 3.5\" Feather Touch focuser, is the Starlight Collet End Cap a good choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The performance of any coma corrector is highly sensitive to alignment. The Starlight Collet End Cap ensures the Paracorr is held perfectly concentric to the optical axis, which is critical for achieving optimal coma correction and sharp stars across the entire photographic field.\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\u003eFocuser Compatibility\u003c\/td\u003e\n\u003ctd\u003eFeather Touch 3.5\" Focusers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Opening\u003c\/td\u003e\n\u003ctd\u003e2.0\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping Style\u003c\/td\u003e\n\u003ctd\u003eCollet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAluminum\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\"\u003e3.5\" End Cap Collet Style w\/ 2.0\" Opening\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\/Starlight_Instruments_3.5in_Feather_Touch_Focuser_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\/starlight-instruments-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eStarlight Instruments 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starlight Instruments","offers":[{"title":"Default Title","offer_id":52948910276893,"sku":"SI-EC35-505","price":308.0,"currency_code":"CAD","in_stock":true}],"url":"https:\/\/davidastro.com\/fr\/products\/starlight-instruments-3-5-end-cap-collet-style-w-2-0-opening","provider":"David Astro","version":"1.0","type":"link"}