--- product_id: 265966194 title: "SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch)" brand: "svbony" price: "€ 79.04" currency: EUR in_stock: true reviews_count: 13 category: "Svbony" url: https://www.desertcart.hr/products/265966194-svbony-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal store_origin: HR region: Croatia --- # 99% Reflectivity Dielectric Coating 90° Viewing Angle for Comfort Brass Compression Ring for Secure Grip SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) **Brand:** svbony **Price:** € 79.04 **Availability:** ✅ In Stock ## Summary > 🔭 Elevate Your Stargazing: See More, Strain Less, Shine Brighter! ## Quick Answers - **What is this?** SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) by svbony - **How much does it cost?** € 79.04 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/265966194-svbony-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal) ## Best For - svbony enthusiasts ## Why This Product - Trusted svbony brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Comfort Meets Precision:** The 90-degree diagonal angle transforms awkward telescope viewing into a neck-friendly, ergonomic experience for those long stargazing sessions. - • **Crystal-Clear Views Every Night:** Experience ultra-sharp, high-contrast images with over 99% reflectivity dielectric coatings that banish ghosting and light scatter. - • **Built to Last, Designed to Impress:** Solid metal construction with a professional feel ensures durability and reliability for every astronomical adventure. - • **Universal Compatibility, Instant Upgrade:** Fits all standard 1.25-inch telescopes and accessories, making it the seamless add-on your setup has been craving. - • **Effortless, Scratch-Free Eyepiece Security:** Brass compression rings ensure your eyepieces stay firmly in place without any damage—upgrade your gear protection game. ## Overview The SV188P Dielectric Mirror Star Diagonal is a premium 1.25-inch telescope accessory featuring over 99% reflective dielectric coatings for superior image clarity, a 90-degree viewing angle for ergonomic comfort, and a brass compression ring that securely holds eyepieces without scratching. Designed for durability and universal compatibility, it transforms your astronomical viewing experience with brighter, sharper images and effortless setup. ## Description desertcart.com : SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) : Electronics Review: A Must-Have Optical Upgrade - Say Goodbye to Ghosting! - I’ve been using this for a few weeks now with my refractor, and the difference between this and the "stock" diagonal that came with my scope is night and day. If you're looking for one single part to improve your viewing experience without breaking the bank, this is it. Brighter, Sharper Views The 99% reflectivity dielectric coating isn't just a marketing gimmick—you can actually see the difference. The blacks are deeper, and the stars are much "tighter." I noticed a significant reduction in light scatter when looking at bright objects like Venus or the Moon. Everything just looks crisper. Protects Your Gear My favorite feature is the brass compression ring. Most cheap diagonals use a simple screw that digs right into your eyepiece barrels, leaving ugly scratches. This ring applies even pressure all the way around, holding my heavy Celestron zoom securely without marking it up. Built for the Long Haul The body is solid metal and has a nice weight to it. It feels like a piece of professional equipment. The 90-degree angle is perfect for those high-altitude targets; no more neck strain trying to get under the tripod to see the Zenith. Bottom Line: It’s an desertcart's Choice for a reason. Great price, excellent build quality, and a noticeable jump in image clarity. It fits any standard 1.25-inch setup perfectly. Review: Satisfactory - High quality product. Exceeded my expectations. Satisfactory shipping and delivery process. ## Features - Dielectric coatings; super flat mirror with dielectric coatings to reduce reflected light loss; provide an over 99% reflective surface; good for astronomical viewing - 1.25 inches nosepiece fits 1.25 inches telescopes; accepts standard 1.25in filters; eyepieces; Barlow lenses and other accessories with a 1.25in insert barrel - 90 degree viewing angle; diagonal reflects the telescope’s light path 90 degree to provide a more comfortable viewing angle; best for observing objects overhead - Correct upside down and left right reversed image; the view image is upright; but left and right reversed if use the 90 degrees to your telescope - Brass compression ring; Built in brass ring and thumbscrew accessories avoid eyepiece to rotate during adjustments; effortless fixes more firmly and will not scratch your eyepieces barrels ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08QRY4V97 | | Additional Features | Dielectric Coatings for High Reflectivity and Brass Compression Ring for Secure Eyepiece Fixing | | Best Sellers Rank | #1 in Telescope Diagonals | | Brand | SVBONY | | Built-In Media | 1X SVBONY SV188P Dielectric Mirror Star Diagonal | | Compatible Devices | Eyepieces, Filters | | Customer Reviews | 4.7 out of 5 stars 341 Reviews | | Finderscope | no | | Focus Type | Fixed Focus | | Item Dimensions D x W x H | 4.4"D x 2.4"W x 3.3"H | | Item Weight | 0.2 Kilograms | | Manufacturer | SVBONY | | Manufacturer Part Number | FCAF9171B | | Model Name | FF9171B | | Model Number | FF9171B | | Objective Lens Diameter | 31.75 Millimeters | | Product Dimensions | 4.4"D x 2.4"W x 3.3"H | | Unit Count | 1.0 Count | | Warranty Description | We provide 1 year warranty for SVBONY telescope accessories and 30 days no reason to return. Beyond the warranty period: We still offer maintain service, buyers are required to afford corresponding costs. We processed in the most hassle-free way possible.You just need to contact with us on Amazon ,we will reply you within 12 hours | ## Product Details - **Brand:** SVBONY - **Compatible Devices:** Eyepieces, Filters - **Finderscope:** no - **Focus Type:** Fixed Focus - **Item Weight:** 0.2 Kilograms - **Manufacturer:** SVBONY - **Model Name:** FF9171B - **Objective Lens Diameter:** 31.75 Millimeters - **Product Dimensions:** 4.4"D x 2.4"W x 3.3"H - **Unit Count:** 1.0 Count ## Images ![SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) - Image 1](https://m.media-amazon.com/images/I/71imU2LlM+L.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Will this fit into the svbony guide scope? the svbony guide scope is reflected and i would like to have the image flipped upright.** A: thanks for your question, for SV188P dielectric mirror star diagonal, it can only fit with SV198 Guide scope. here is the link: https://www.amazon.com/dp/B09C8913FZ?ref=myi_title_dp If any, please contact us through Amazon message. **Q: Svbony, is this diagonal actually painted red on the inside as some buyers indicated?** A: Unless there are two versions of this diagonal just know that the side panels ARE red on the outside AND inside. As some buyers report this could cause a reddish reflection that might cast a red hue onto what is being viewed, particularly brighter objects I would guess. Due to cloudiness, I haven't been able to test that possibility yet. Otherwise it's a nice 99% diagonal. **Q: Does this diagonal have a stop to keep a standard size Barlow tube from colliding with the mirror?** A: thanks for the question. For the SVBONY SV188P Dielectric Mirror Star Diagonal, there is no blocking thing, the end where the eyepiece or accessories are installed, there is about 45mm long installation space in the inner section, don't worry about touching the lens. **Q: "when use the sv188p with maksutov-cassegrain (mak-cass) or schmidt-cassegrain telescope, you need a special adapter." what is the needed adapter?** A: thanks for your question. If your telescope has a two-inch interface, you may need a 2-inch to 1.25-inch adapter ring. ## Customer Reviews ### ⭐⭐⭐⭐⭐ A Must-Have Optical Upgrade - Say Goodbye to Ghosting! *by D***4 on April 8, 2026* I’ve been using this for a few weeks now with my refractor, and the difference between this and the "stock" diagonal that came with my scope is night and day. If you're looking for one single part to improve your viewing experience without breaking the bank, this is it. Brighter, Sharper Views The 99% reflectivity dielectric coating isn't just a marketing gimmick—you can actually see the difference. The blacks are deeper, and the stars are much "tighter." I noticed a significant reduction in light scatter when looking at bright objects like Venus or the Moon. Everything just looks crisper. Protects Your Gear My favorite feature is the brass compression ring. Most cheap diagonals use a simple screw that digs right into your eyepiece barrels, leaving ugly scratches. This ring applies even pressure all the way around, holding my heavy Celestron zoom securely without marking it up. Built for the Long Haul The body is solid metal and has a nice weight to it. It feels like a piece of professional equipment. The 90-degree angle is perfect for those high-altitude targets; no more neck strain trying to get under the tripod to see the Zenith. Bottom Line: It’s an Amazon's Choice for a reason. Great price, excellent build quality, and a noticeable jump in image clarity. It fits any standard 1.25-inch setup perfectly. ### ⭐⭐⭐⭐⭐ Satisfactory *by M***I on May 30, 2026* High quality product. Exceeded my expectations. Satisfactory shipping and delivery process. ### ⭐⭐⭐⭐⭐ Sturdy and sharp *by O***Y on April 9, 2026* This Chinese brand of optical goods continues to impress me for value. So far, the telescope and accessories I have purchased through Amazon have delivered very good performance, allowing me to put my heavy 8" Newtonian telescope in storage in favor of a much lighter 102mm refractor that accepts 2" eyepieces. This star diagonal delivers sharp, contrasty views of both bright objects and starfields. ## Frequently Bought Together - SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) - SVBONY SV135 Zoom Eyepiece, Zoom 7 to 21mm 1.25 Inch Telescope Eyepiece, 6 Element 4 Group Telescope Accessories for Astronomic Telescopes Visual - SVBONY Barlow Lens 2X, 1.25 inch Barlow Lens with Multi Coated Broadband Green Film, Telescope Accessories with M42 Thread for Telescope Eyepiece --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/265966194-svbony-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal](https://www.desertcart.hr/products/265966194-svbony-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-10*