{"product_id":"svbony-sv188p-dielectric-mirror-star-diagonal-99-reflectivity","title":"SVBONY SV188P Dielectric Mirror Star Diagonal - 99% Reflectivity","description":"\u003cp\u003eIn this review the SVBONY SV188P Dielectric Mirror Star Diagonal is examined for backyard astronomers and casual observers who want a brighter, more comfortable eyepiece position. The bottom line: this 90 degree diagonal uses a super flat dielectric mirror that delivers over 99% reflectivity and a low-profile design that keeps the optical train well aligned. It is best for 1.25 in eyepiece users who value image clarity and secure eyepiece retention during adjustments.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eDielectric coatings:\u003c\/strong\u003e Provide an over 99% reflective surface that preserves light for brighter views of planets and the Moon.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSuper flat mirror:\u003c\/strong\u003e Keeps the optical path aligned so stars remain sharp across the field rather than appearing distorted.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e90 degree viewing angle:\u003c\/strong\u003e Reflects the telescope's light path for comfortable observing of objects near zenith without neck strain.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e1.25 in compatibility:\u003c\/strong\u003e Fits standard 1.25 in telescopes and accepts filters, eyepieces and Barlow lenses with a 1.25 in insert barrel.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eBrass compression ring:\u003c\/strong\u003e Built-in brass ring and thumbscrew secure eyepieces firmly while avoiding scratches to the barrel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe SV188P is aimed at amateur astronomers using 1.25 in eyepieces who want improved light throughput and a comfortable 90 degree viewing position for long observing sessions. It suits those who appreciate a compact, well-built diagonal that aligns optically and accepts common accessories like filters and Barlow lenses.\u003c\/p\u003e\n\n\u003cp\u003eObservers who need an erect image for terrestrial use or who require a mirror that preserves true left-right orientation should note this diagonal produces an upright image but will be left-right reversed in a 90 degree configuration. Also, users with 2 in systems will need a different diagonal size.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eHigh reflectivity dielectric coatings deliver a bright, clear view with minimal light loss.\u003c\/li\u003e\n \u003cli\u003eSolid build and low-profile 90 degree form that customers praised for alignment and appearance.\u003c\/li\u003e\n \u003cli\u003eBrass compression ring and thumbscrew keep eyepieces secure without scratching.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eSome users report mixed color accuracy, with occasional false color on certain targets or eyepieces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV188P\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eConnection size\u003c\/td\u003e\n\u003ctd\u003e1.25 in nosepiece\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eReflective coating\u003c\/td\u003e\n\u003ctd\u003eDielectric coatings, \u0026gt;99% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eViewing angle\u003c\/td\u003e\n\u003ctd\u003e90 degree mirror diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eRetention\u003c\/td\u003e\n\u003ctd\u003eBrass compression ring with thumbscrew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV188P is a practical, well-made dielectric diagonal that offers genuine improvement in light throughput and comfortable viewing for 1.25 in eyepiece users. It is good value for observers who prioritize image clarity and solid mechanical retention, though those sensitive to subtle color shifts should be aware of mixed reports on color accuracy.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this diagonal fit my 1.25 in eyepieces?\u003c\/strong\u003e\u003cbr\u003eYes, the diagonal accepts standard 1.25 in insert barrels and will work with eyepieces, filters and Barlow lenses sized to 1.25 in.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the diagonal correct image orientation?\u003c\/strong\u003e\u003cbr\u003eThe SV188P provides an upright view but will be left-right reversed when used at 90 degrees; it is not a mirror that gives a true non-reversed terrestrial orientation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the mirror durable and secure?\u003c\/strong\u003e\u003cbr\u003eThe super flat dielectric mirror and the built-in brass compression ring with thumbscrew provide secure, scratch-free retention and stable alignment during use.\u003c\/p\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":48266251272411,"sku":"B08QRY4V97","price":37.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71imU2LlM_L._AC_SL1500.jpg?v=1778292384","url":"https:\/\/gearmusthave.com\/products\/svbony-sv188p-dielectric-mirror-star-diagonal-99-reflectivity","provider":"GearMustHave","version":"1.0","type":"link"}