---
product_id: 265966194
title: "SV188P Telescope Diagonal 1.25\" 90°Mirror Diagonal 99% Reflectivity | Upright Image, Reflectivity Dielectric Coatings Increase Brightness Sharp and Clear, with Brass Compression Rings Fixed Tight"
brand: "svbony"
price: "₨1242"
currency: SCR
in_stock: true
category: "Svbony"
url: https://www.desertcart.sc/products/265966194-sv188p-telescope-diagonal-1-25-90-mirror-diagonal-99-reflectivity
store_origin: SC
region: Seychelles
---

# 99% Reflectivity dielectric mirror 90° diagonal for ergonomic viewing Brass compression ring for secure eyepiece fit SV188P Telescope Diagonal 1.25" 90°Mirror Diagonal 99% Reflectivity | Upright Image, Reflectivity Dielectric Coatings Increase Brightness Sharp and Clear, with Brass Compression Rings Fixed Tight

**Brand:** svbony
**Price:** ₨1242
**Availability:** ✅ In Stock

## Summary

> 🔭 Elevate your stargazing game with precision and comfort!

## Quick Answers

- **What is this?** SV188P Telescope Diagonal 1.25" 90°Mirror Diagonal 99% Reflectivity | Upright Image, Reflectivity Dielectric Coatings Increase Brightness Sharp and Clear, with Brass Compression Rings Fixed Tight by svbony
- **How much does it cost?** ₨1242 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/265966194-sv188p-telescope-diagonal-1-25-90-mirror-diagonal-99-reflectivity)

## 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, preventing rotation and damage during adjustments.
- • **Comfort Meets Precision:** The 90° mirror diagonal redirects your telescope’s light path for effortless, strain-free viewing of overhead objects.
- • **Universal Compatibility:** Fits all standard 1.25-inch telescopes and accessories, including filters, eyepieces, and Barlow lenses—upgrade without hassle.
- • **Crystal-Clear Views Every Night:** Dielectric coatings deliver over 99% reflectivity, maximizing brightness and sharpness for your celestial observations.
- • **Trusted by Stargazers Worldwide:** Ranked #1 in telescope diagonals with a stellar 4.7-star rating from over 330 enthusiasts—join the elite viewing community.

## Overview

The SVBONY SV188P 1.25" 90° telescope diagonal features a super-flat dielectric mirror with over 99% reflectivity for enhanced brightness and clarity. Designed for ergonomic viewing, it fits standard 1.25" telescope accessories and secures eyepieces with a durable brass compression ring. Highly rated and trusted by astronomy enthusiasts, it ensures a comfortable, crystal-clear celestial experience.

## Description

desertcart.com : SVBONY SV188P Telescope Diagonal 1.25" 90°Mirror Diagonal 99% Reflectivity | Upright Image, Reflectivity Dielectric Coatings Increase Brightness Sharp and Clear, with Brass Compression Rings Fixed Tight : Electronics

## 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 4.7 out of 5 stars (330) |
| 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 kg |
| Manufacturer | SVBONY |
| Manufacturer Part Number | FCAF9171B |
| Model Name | FF9171B |
| Model Number | FF9171B |
| Number of Items | 1 |
| Objective Lens Diameter | 31.75 millimeters |
| Unit Count | 1 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 kg
- **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 Count

## Images

![SV188P Telescope Diagonal 1.25" 90°Mirror Diagonal 99% Reflectivity | Upright Image, Reflectivity Dielectric Coatings Increase Brightness Sharp and Clear, with Brass Compression Rings Fixed Tight - 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.

## 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

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-09-12*