--- product_id: 387957015 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: "363.92 DT" currency: TND in_stock: true reviews_count: 5 category: "Svbony" url: https://www.desertcart.tn/products/387957015-svbony-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal store_origin: TN region: Tunisia --- # 99% reflectivity dielectric coatings 90° viewing angle for ergonomic comfort Brass compression ring for secure eyepiece fit SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) **Brand:** svbony **Price:** 363.92 DT **Availability:** ✅ In Stock ## Summary > 🔭 Elevate your stargazing game with precision and comfort! ## 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?** 363.92 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/387957015-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 - • **Lock-In Stability:** Built-in brass compression ring and thumbscrew prevent eyepiece rotation, keeping your view steady during adjustments. - • **Comfort Meets Precision:** 90-degree diagonal angle transforms your telescope’s light path for effortless, strain-free viewing of celestial wonders. - • **Universal Compatibility:** Fits all standard 1.25-inch eyepieces, filters, and Barlow lenses—upgrade your setup without hassle. - • **Crystal-Clear Views Every Night:** Super-flat dielectric mirror ensures over 99% light reflection for flawless astronomical observations. - • **Trusted by Stargazers Worldwide:** Top-rated with 4.8 stars and praised for premium build quality—join the elite community of astronomy pros. ## Overview The SVBONY SV188P Dielectric Mirror Star Diagonal features a super-flat mirror with advanced dielectric coatings delivering over 99% reflectivity. Designed for 1.25-inch telescopes, it offers a 90-degree viewing angle for ergonomic comfort and includes a brass compression ring to securely hold eyepieces in place. Ideal for professional and amateur astronomers seeking crystal-clear, stable views of the night sky. ## Description SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings Review: Excellent quality, no plastic pieces except covers. Flawless image diagonal. - Excellent quality and the 99% along with the enhanced lambda flatness of it produces flawless reflection. High quality piece, it came quickly and very well packaged. Recommended. Review: Confio comprar na desertcart, eles nunca me deram canseira, são pontual - Produto original, a qualidade do material é excelente, amei ## 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 reduced light loss and 90-degree viewing angle | | Best Sellers Rank | #18,951 in Electronics ( See Top 100 in Electronics ) #1 in Telescope Diagonals | | Brand | SVBONY | | Built-In Media | 1X SVBONY SV188P Dielectric Mirror Star Diagonal | | Compatible Devices | Eyepieces, Filters | | Customer Reviews | 4.8 out of 5 stars 317 Reviews | | Finderscope | no | | Focus Type | Fixed Focus | | Focus type | Fixed Focus | | Item Dimensions D x W x H | 11.2D x 6.1W x 8.4H centimeters | | Item Weight | 0.2 Kilograms | | Manufacturer | SVBONY | | Manufacturer Part Number | FCAF9171B | | Model Name | FF9171B | | Model Number | FF9171B | | Model name | FF9171B | | Objective Lens Diameter | 31.75 Millimeters | | Objective lens diameter | 31.75 Millimeters | | Product dimensions | 11.2D x 6.1W x 8.4H centimeters | | Unit Count | 1 Count | ## Product Details - **Brand:** SVBONY - **Focus type:** Fixed Focus - **Model name:** FF9171B - **Objective lens diameter:** 31.75 Millimeters - **Product dimensions:** 11.2D x 6.1W x 8.4H centimeters ## 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) ![SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) - Image 2](https://m.media-amazon.com/images/I/71Ij1EICEWL.jpg) ![SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) - Image 3](https://m.media-amazon.com/images/I/817zmNBbyaL.jpg) ![SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) - Image 4](https://m.media-amazon.com/images/I/81uzZXKOyUL.jpg) ![SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch) - Image 5](https://m.media-amazon.com/images/I/71lDyEQ2Y3L.jpg) ## 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 ### ⭐⭐⭐⭐⭐ Excellent quality, no plastic pieces except covers. Flawless image diagonal. *by D***K on 29 June 2026* Excellent quality and the 99% along with the enhanced lambda flatness of it produces flawless reflection. High quality piece, it came quickly and very well packaged. Recommended. ### ⭐⭐⭐⭐⭐ Confio comprar na Amazon, eles nunca me deram canseira, são pontual *by 1***2 on 4 April 2026* Produto original, a qualidade do material é excelente, amei ### ⭐⭐⭐⭐⭐ Great value for money *by R***Y on 27 December 2025* This product gives full value for the money.It is a part of the telescope which can really make a difference,especially if the one being replaced is stock ,which came with the telescope. ## 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.tn/products/387957015-svbony-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal](https://www.desertcart.tn/products/387957015-svbony-sv188p-dielectric-mirror-star-diagonal-90-degree-mirror-diagonal) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-11*