--- product_id: 381043030 title: "SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings" brand: "svbony" price: "€ 140.00" currency: EUR in_stock: true reviews_count: 7 url: https://www.desertcart.hr/products/381043030-sv188p-dielectric-mirror-star-diagonal-1-25-inch-90-degree store_origin: HR region: Croatia --- # 99% Reflectivity 90° Viewing Angle Brass Compression Rings SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings **Brand:** svbony **Price:** € 140.00 **Availability:** ✅ In Stock ## Summary > 🔭 Elevate your stargazing game—see the cosmos like never before! ## Quick Answers - **What is this?** SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings by svbony - **How much does it cost?** € 140.00 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/381043030-sv188p-dielectric-mirror-star-diagonal-1-25-inch-90-degree) ## 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 - • **Upright Image Correction:** Enjoy correctly oriented images for intuitive navigation of the night sky, perfect for serious observers. - • **Universal 1.25" Compatibility:** Fits all standard 1.25-inch telescopes, eyepieces, filters, and Barlow lenses—upgrade without hassle. - • **Secure Brass Compression Rings:** Keeps your eyepieces locked firmly in place without scratches, ensuring smooth, precise adjustments. - • **Comfort-First 90° Viewing Angle:** Ergonomically redirects your telescope’s light path for effortless, strain-free stargazing sessions. - • **Crystal-Clear Views with 99% Reflectivity:** Super-flat dielectric coatings maximize light reflection for stunningly bright, sharp astronomical images. ## Overview The SV188P Dielectric Mirror Star Diagonal features advanced dielectric coatings delivering over 99% reflectivity, a 90-degree mirror angle for comfortable viewing, and durable brass compression rings to secure your eyepieces. Designed for 1.25-inch telescope accessories, it enhances brightness and image clarity, making it an essential upgrade for amateur and professional astronomers alike. ## Description SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings Review: Great value for money - 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. Review: Best - Good product...it will increase brightness which is important in deep sky but it is not usful in daytime because it will show reverse image.... ## 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 | #163,094 in Electronics ( See Top 100 in Electronics ) #2 in Telescope Diagonals & Erecting Prisms | | Box Contents | 1X SVBONY SV188P Dielectric Mirror Star Diagonal | | Brand | SVBONY | | Brand Name | SVBONY | | Customer Reviews | 4.8 out of 5 stars 302 Reviews | | Finderscope | no | | 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 | | Objective Lens Diameter | 31.75 Millimeters | | Product Dimensions | 11.2D x 6.1W x 8.4H Centimeters | ## Images ![SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings - Image 1](https://m.media-amazon.com/images/I/71imU2LlM+L.jpg) ![SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings - Image 2](https://m.media-amazon.com/images/I/71Ij1EICEWL.jpg) ![SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings - Image 3](https://m.media-amazon.com/images/I/817zmNBbyaL.jpg) ![SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings - Image 4](https://m.media-amazon.com/images/I/81uzZXKOyUL.jpg) ![SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings - 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 ### ⭐⭐⭐⭐⭐ 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. ### ⭐⭐⭐⭐ Best *by N***R on 3 June 2025* Good product...it will increase brightness which is important in deep sky but it is not usful in daytime because it will show reverse image.... ### ⭐⭐⭐⭐⭐ Much better than stock diagonals, brighter and clearer views *by D***N on 21 December 2023* I didn't expect a 55$ diagonal to blow me away, but here we are. I recently purchased a Skywatcher 102mm StarTravel, the included 45 degree diagonal is perfectly usable for terrestrial, but for sky observing with objects high, it's much more of a problem. I was recommended this diagonal from a friend, and I was blown away with the difference in brightness and clarity of viewing. I have purchased a few SVbony products and they never fail to impress. This diagonal is no different. The mirror is huge compared to cheaper diagonals, and the dialectic coatings make it much brighter. If you need a diagonal buy this one with confidence. It comes with a brass band and not just a screw, so your eyepieces shouldn't get scratched up. Getting used to left and right being backwards, takes some getting used to, but it's definitely not a deal breaker. An unexpected side benefit, is the mirror is very easy to clean. (with a microfiber cloth) That was a problem with the default one that came with the scope. ## 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/381043030-sv188p-dielectric-mirror-star-diagonal-1-25-inch-90-degree](https://www.desertcart.hr/products/381043030-sv188p-dielectric-mirror-star-diagonal-1-25-inch-90-degree) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-23*