{"product_id":"askar-52mm-f4-guide-scope","title":"Askar 52mm F4 Guide Scope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAperture: 52mm\u003c\/li\u003e\n\u003cli\u003eFocal Length: 208mm\u003c\/li\u003e\n\u003cli\u003eFocal Ratio: f\/4\u003c\/li\u003e\n\u003cli\u003eFocuser: Helical with 25mm travel\u003c\/li\u003e\n\u003cli\u003eWeight: 631g\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\u003eAskar 52mm F4 Guide Scope\u003c\/h2\u003e\n      \u003cp\u003eThe Askar 52mm F4 Guide Scope combines a 52mm aperture with a fast 208mm focal length, delivering a bright image field essential for reliable multi-star guiding. Its optical design includes one element of Extra-Low Dispersion (ED) glass for sharp, high-contrast guide stars, and the entire assembly weighs just 631g.\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\u003e52mm f\/4 ED Optics for Precision Guiding\u003c\/h3\u003e\n      \u003cp\u003eWith a 52mm objective, this guidescope gathers significantly more light than standard 30mm finders, revealing fainter stars even in sparse regions of the sky. The fast f\/4 focal ratio allows your guide camera to use shorter exposures, enabling more rapid and responsive corrections to tracking errors from your mount.\u003c\/p\u003e\n      \u003cp\u003eThe inclusion of an ED glass element minimizes chromatic aberration, ensuring guide stars are rendered as tight, focused points of light. This improves the accuracy of centroid calculations in your guiding software, allowing for the sub-pixel precision required for imaging with long focal length instruments.\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\u003e25mm Helical Focuser with M42 \u0026amp; 1.25\" Outputs\u003c\/h3\u003e\n      \u003cp\u003eAchieving and maintaining sharp focus is critical for autoguiding. The Askar 52mm scope features a precision helical focuser with 25mm of travel, providing smooth, exact adjustments without image shift or rotation. This range is sufficient to bring a wide variety of guide cameras to a sharp focus.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eM42 Male Thread:\u003c\/strong\u003e Provides a direct, rigid connection for cameras equipped with a corresponding female M42x0.75 thread, eliminating any potential for flexure.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003e1.25\" Adapter:\u003c\/strong\u003e Ensures universal compatibility with the vast majority of standard astronomy guide cameras that use a 1.25\" nosepiece.\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\"\u003eWhat guide cameras are compatible with the Askar 52mm F4 Guide Scope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Askar 52mm F4 Guide Scope is highly compatible, offering two connection methods. You can use any guide camera with a standard \u003cstrong\u003e1.25\" nosepiece\u003c\/strong\u003e via the included adapter, or you can directly thread on any camera that has female \u003cstrong\u003eM42x0.75 T-threads\u003c\/strong\u003e for a more secure connection.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is ED glass important in a guidescope like the Askar 52mm?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eExtra-Low Dispersion (ED) glass\u003c\/strong\u003e corrects for chromatic aberration, or color fringing. In a guidescope, this means stars appear as tighter, more focused points without blue or purple halos. Guiding software can calculate the center of a sharp star more accurately, leading to more precise tracking corrections.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar 52mm F4 Guide Scope perform when guiding a 10\" SCT on a faint target?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e52mm aperture\u003c\/strong\u003e is a significant advantage in this scenario. Compared to smaller 30mm guidescopes, it gathers much more light, allowing you to find suitable guide stars even when pointed at faint objects far from the galactic plane. The f\/4 speed also allows for short, sensitive exposures, which is crucial for making the rapid corrections needed to guide a long focal length telescope like an SCT.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of a helical focuser on the Askar 52mm Guide Scope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA helical focuser provides very fine, precise focus control by twisting the barrel. Unlike a simple sliding tube, it allows for minute adjustments that are repeatable and hold their position securely once set. This ensures your guide stars remain perfectly sharp throughout an imaging session.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar 52mm F4 as a wide-field finder scope with a 1.25\" eyepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, absolutely. With its 208mm focal length and the included 1.25\" adapter, the Askar 52mm F4 doubles as an excellent, high-quality optical finder. Paired with a low-power 1.25\" eyepiece, it will provide bright, wide-field views to help you locate and center objects in your main telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow much does the Askar 52mm Guide Scope weigh and will it affect my mount's balance?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe scope weighs \u003cstrong\u003e631g\u003c\/strong\u003e. While heavier than entry-level 30mm guidescopes, this weight is manageable for most equatorial mounts capable of astrophotography. It's a necessary trade-off for the superior light-gathering of the 52mm aperture. Always ensure your system is properly balanced after adding any new equipment.\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\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e52mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e208mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e1x ED Glass Element\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocuser Type\u003c\/td\u003e\n\u003ctd\u003eHelical Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOutput Connections\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 Male Thread, 1.25\" Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e631g\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Colors\u003c\/td\u003e\n\u003ctd\u003eBlack, Silver\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\/Askar_52mm_F4_Guide_Scope_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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Black","offer_id":49024014975261,"sku":"ASK-ASKAR52GS-BK","price":197.0,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":49024014942493,"sku":"ASK-ASKAR52GS-SV","price":197.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-52mm-f4-Guide-scope-1.jpg?v=1723301881","url":"https:\/\/davidastro.com\/fr-us\/products\/askar-52mm-f4-guide-scope","provider":"David Astro","version":"1.0","type":"link"}