--- product_id: 265966194 title: "SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch)" brand: "svbony" price: "€ 82.09" currency: EUR in_stock: true reviews_count: 13 category: "Svbony" url: https://www.desertcart.hr/products/265966194-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal-99 store_origin: HR region: Croatia --- # 99% reflectivity dielectric coatings 90° viewing angle for ergonomic comfort Brass compression ring prevents eyepiece rotation SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) **Brand:** svbony **Price:** € 82.09 **Availability:** ✅ In Stock ## Summary > 🔭 Elevate your stargazing game with precision and comfort! ## Quick Answers - **What is this?** 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?** € 82.09 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-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal-99) ## 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 - • **Secure & Scratch-Free:** Built-in brass compression ring and thumbscrew lock your eyepiece firmly in place—no slips, no scratches, just smooth adjustments. - • **Trusted by Stargazers:** Top-rated (#1 in Telescope Diagonals) with 4.8 stars from over 300 reviews—join the community of satisfied astronomy pros. - • **Comfort Meets Precision:** 90-degree diagonal angle transforms your telescope’s light path for effortless, strain-free viewing of celestial wonders overhead. - • **Universal Compatibility:** Fits all standard 1.25-inch telescopes and accessories, including filters, eyepieces, and Barlow lenses—upgrade without hassle. - • **Crystal-Clear Views Every Time:** Super-flat dielectric mirror delivers over 99% light reflection for stunningly bright and sharp astronomical images. ## Overview The SVBONY SV188P Dielectric Mirror Star Diagonal features a super-flat mirror with advanced dielectric coatings that reflect over 99% of light, ensuring brighter and clearer astronomical views. Designed with a 90-degree viewing angle, it offers ergonomic comfort for observing objects overhead. Its 1.25-inch nosepiece fits standard telescopes and accessories, while the brass compression ring secures eyepieces firmly without damage. Highly rated and a bestseller, this diagonal is a must-have upgrade for serious amateur astronomers. ## 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: Well Made Diagonal - This diagonal was a great upgrade compared to the diagonal that came with the telescope. The build quality is impressive. The price is incredible for the quality Much clearer image. Lots more light in the eyepiece Would buy again or recommend. So far the Svbony products I have purchased have all been top notch Review: Great Product! - Great clarity, value for money, very well made. ## 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 | | Best Sellers Rank | #1 in Telescope Diagonals | | Customer Reviews | 4.8 4.8 out of 5 stars (323) | | Date First Available | December 16, 2020 | | Item Weight | 7 ounces | | Item model number | FF9171B | | Manufacturer | SVBONY | | Product Dimensions | 4.4 x 3.3 x 2.4 inches | ## Images ![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 ### ⭐⭐⭐⭐⭐ Well Made Diagonal *by R***D on July 23, 2024* This diagonal was a great upgrade compared to the diagonal that came with the telescope. The build quality is impressive. The price is incredible for the quality Much clearer image. Lots more light in the eyepiece Would buy again or recommend. So far the Svbony products I have purchased have all been top notch ### ⭐⭐⭐⭐⭐ Great Product! *by S***R on March 14, 2025* Great clarity, value for money, very well made. ### ⭐⭐⭐⭐⭐ 2" angle. Very good quality at ridiculously low price. *by B***N on October 25, 2025* Exactly as advertised. Super fast shipping with Prime. ## 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-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal-99](https://www.desertcart.hr/products/265966194-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal-99) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-04-25*