{"product_id":"svbony-sv152-20mm-70-swa-illuminated-crosshair-eyepiece-125in","title":"SVBONY SV152 20mm 70° SWA Illuminated Crosshair Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e20mm Focal Length\u003c\/li\u003e\n\u003cli\u003e70° Super Wide Apparent Field of View\u003c\/li\u003e\n\u003cli\u003eAdjustable LED-Illuminated Single Crosshair\u003c\/li\u003e\n\u003cli\u003e16mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel with M28.5*0.6 Filter Threads\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\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\u003eSVBONY SV152 20mm SWA 70° Illuminated Crosshair Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV152 20mm SWA 70° Illuminated Crosshair Eyepiece transforms object centering from guesswork into a repeatable, precise operation. Its 5-element, 4-group optical design provides a generous 70-degree apparent field of view, making it easy to locate guide stars or GoTo alignment targets. With 16mm of eye relief and a bright, adjustable LED-illuminated single crosshair, this eyepiece is an essential tool for manual guiding, drift alignment, and accurate initial setup, all housed in a durable metal body weighing just 221g.\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\u003e70° Field of View: A Wide Window for Precision Centering\u003c\/h3\u003e\n\u003cp\u003eA narrow field of view makes finding and centering alignment stars a frustrating task. The SV152's 70-degree Super Wide Angle (SWA) design provides an expansive backdrop, so your target star is easier to locate and bring to the center of the 25mm field stop. The 20mm focal length offers a versatile medium power, ideal for the initial alignment stages of a GoTo system or for finding a suitable guide star for manual off-axis guiding.\u003c\/p\u003e\n\u003cp\u003eThe 5-element optical system is fully multi-coated (FMC) to maximize light transmission. This ensures that even faint stars near the edge of your guide scope's field are visible against the illuminated reticle, a critical factor when working in light-polluted skies or targeting dim objects.\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\u003eAdjustable LED Illumination Across a 25mm Field Stop\u003c\/h3\u003e\n\u003cp\u003eThe core of the SV152 is its single crosshair reticle, illuminated by an adjustable LED. The ability to fine-tune the brightness is not a luxury—it's essential for accuracy. A reticle that is too bright will overwhelm a faint guide star, making it impossible to see, while one that is too dim is useless. The variable control lets you set the crosshair's brightness just above the background skyglow for perfect visibility without compromising your dark adaptation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e The eyepiece is housed in a metal body, ensuring the optics remain aligned and the illuminator withstands regular use in the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Power:\u003c\/strong\u003e The illuminator is powered by two common 1.5V batteries, making replacements easy to find.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Ready:\u003c\/strong\u003e The 1.25\" barrel is threaded for M28.5*0.6 filters, allowing you to use a moon filter to reduce glare when centering on bright alignment stars.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSVBONY SV152 vs. a Standard Eyepiece: A Tool for Accuracy\u003c\/h3\u003e\n\u003cp\u003eA standard viewing eyepiece can only give you a subjective sense of \"center.\" For critical applications like polar alignment or centering a target for a small-sensor planetary camera, \"close enough\" isn't good enough. The SV152 provides a fixed, objective reference point that removes all ambiguity.\u003c\/p\u003e\n\u003cp\u003eWhile a standard Plössl eyepiece may be slightly lighter, it lacks the fundamental capability to measure drift or confirm centering. With the SV152's illuminated crosshair, you can precisely place an alignment star in the exact center of the field as required by your GoTo system, or carefully track the drift of a star for a highly accurate polar alignment. It is a diagnostic and alignment tool, not just a viewing accessory.\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 SVBONY SV152 20mm eyepiece primarily used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV152 is a specialized eyepiece designed for tasks requiring precise centering of celestial objects. Its primary uses include \u003cstrong\u003eGoTo mount alignment\u003c\/strong\u003e, \u003cstrong\u003emanual guiding\u003c\/strong\u003e for astrophotography, and performing \u003cstrong\u003edrift alignment\u003c\/strong\u003e for accurate polar alignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I power the illuminator on the SV152 eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adjustable LED illuminator is powered by \u003cstrong\u003etwo 1.5V batteries\u003c\/strong\u003e. The brightness can be adjusted via a small dial on the illuminator unit, allowing you to match the crosshair's intensity to the brightness of your target star.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 16mm eye relief on the SVBONY SV152 sufficient for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith \u003cstrong\u003e16mm of eye relief\u003c\/strong\u003e, most eyeglass wearers should be able to see a significant portion, if not all, of the 70-degree field of view. While not as long as some dedicated long-eye-relief designs, it is generally comfortable for the short, precise observations this eyepiece is designed for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the SVBONY SV152 20mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel is threaded with a standard \u003cstrong\u003eM28.5*0.6 thread\u003c\/strong\u003e, making it compatible with all standard 1.25\" astronomy filters. This is useful for adding a moon filter to reduce the glare of bright alignment stars like Sirius or Vega.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SVBONY SV152 help with polar aligning my 8-inch SCT using the drift alignment method?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor drift alignment with an 8-inch SCT, the SV152's illuminated crosshair is essential. After orienting the crosshairs north-south and east-west, you can watch a star drift relative to the fixed lines. The crosshair allows you to accurately judge the direction and speed of the drift, enabling you to make precise adjustments to your mount's altitude and azimuth for a near-perfect polar alignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen setting up my GoTo mount, how does the SV152 make centering a bright star like Vega (Alpha Lyrae) more accurate than a standard eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen your GoTo handset instructs you to \"center Vega,\" a standard eyepiece forces you to guess the exact center of the field. With the SVBONY SV152, you simply move the mount until Vega is perfectly bisected by the illuminated crosshairs. This removes subjective error and provides your mount's alignment model with a much more accurate position, resulting in more precise GoTo slews all night.\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 Length\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e70-Degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Port\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Design\u003c\/td\u003e\n\u003ctd\u003e5 elements in 4 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated (FMC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReticle\u003c\/td\u003e\n\u003ctd\u003eSingle Crosshair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIlluminator\u003c\/td\u003e\n\u003ctd\u003eAdjustable Brightness LED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Source\u003c\/td\u003e\n\u003ctd\u003e2 x 1.5V Batteries\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop\u003c\/td\u003e\n\u003ctd\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5*0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyecup\u003c\/td\u003e\n\u003ctd\u003eRubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e221g \/ 7.8oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e75*53*102mmmm\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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861231923485,"sku":"SV-W9115A","price":64.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV152-20mm-SWA-70-Illuminated-Crosshair-Eyepiece-1-25-inch-1_b5f3175b-a7e3-48d5-913d-3dcdea361090.jpg?v=1788883362","url":"https:\/\/davidastro.com\/en-us\/products\/svbony-sv152-20mm-70-swa-illuminated-crosshair-eyepiece-125in","provider":"David Astro","version":"1.0","type":"link"}