---
product_id: 175832978
title: "Celestron 93573 Dielectric Star Diagonal 2\" with Twist Lock"
brand: "celestron"
price: "$674.84"
currency: USD
in_stock: true
reviews_count: 13
category: "Celestron"
url: https://www.desertcart.us/products/175832978-celestron-93573-dielectric-star-diagonal-2-with-twist-lock
store_origin: US
region: United States of America
---

# 90° twist-lock viewing angle 99%+ light reflectivity 58-layer dielectric coatings Celestron 93573 Dielectric Star Diagonal 2" with Twist Lock

**Brand:** celestron
**Price:** $674.84
**Availability:** ✅ In Stock

## Summary

> 🌌 Unlock the cosmos with crystal-clear precision—because your telescope deserves the best!

## Quick Answers

- **What is this?** Celestron 93573 Dielectric Star Diagonal 2" with Twist Lock by celestron
- **How much does it cost?** $674.84 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/175832978-celestron-93573-dielectric-star-diagonal-2-with-twist-lock)

## Best For

- celestron enthusiasts

## Why This Product

- Trusted celestron brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Engineered to Impress:** Durable anodized aluminum body with glare-reducing interior ensures premium build and performance.
- • **Universal Compatibility:** Includes stepdown adapter for seamless use with both 2” and 1.25” eyepieces and accessories.
- • **Comfort Meets Performance:** 90° viewing angle reduces neck strain for marathon stargazing sessions.
- • **Brilliant Clarity, Every Night:** 58 layers of dielectric coatings deliver over 99% reflectivity for ultra-bright, crisp views.
- • **Effortless Precision Alignment:** Twist-lock mechanism secures eyepieces perfectly centered—no scratches, just flawless optics.

## Overview

The Celestron 93573 Dielectric Star Diagonal 2” with Twist Lock enhances your telescope’s performance by delivering over 99% light reflectivity through 58 layers of dielectric coatings. Its 90° viewing angle and twist-lock eyepiece holder provide comfortable, precise, and scratch-free viewing. Compatible with both 2” and 1.25” eyepieces via included adapters, this premium diagonal is crafted from anodized aluminum with glare-reducing interiors, making it a must-have upgrade for serious amateur astronomers seeking brighter, sharper images without replacing their telescope.

## Description

Ensure maximum light transmission without loss of optical quality with the Celestron Dielectric Star Diagonal, 2” with Twist-Lock. Upgrade your existing star diagonal to this premium one and enjoy brighter, sharper images without purchasing an entirely new telescope. This star diagonal reflects the telescope’s light path 90° to provide a more comfortable viewing angle. In addition, the glass has 58 layers of dielectric coatings, which provide an over 99% reflective surface, delivering the maximum amount of light to the eyepiece. This 2” star diagonal has the added benefit of allowing you to use larger 2” eyepieces with your telescope, providing a wider field of view, or standard 1. 25” eyepieces with the stepdown adapter. The twist-lock eyepiece holder secures eyepieces while keeping them centered in the diagonal, thus providing best opto-mechanical alignment between the telescope and eyepiece. Unlike traditional thumb screws, the twist-lock cannot scratch or engrave the barrel of your eyepieces. The diagonal has an integrated 2” barrel stop that prevents 2” accessories with long barrels from damaging the mirror. All the diagonal’s mechanical parts are made of machined black anodized aluminum, except the twist lock rings, which are orange anodized for visibility. The interior of the Schmidt-Cassegrain adapter and 2” barrel are glare threaded and painted flat black to prevent glare. With all its features and these high-end finishes, the Celestron Dielectric Star Diagonal, 2” with Twist-Lock is one of the highest quality 2" star diagonals that Celestron has ever offered. This diagonal also comes with two interchangeable barrels to provide flexibility in connecting the diagonal to a wide variety of telescopes without the need for additional adapters. For telescopes, like refractors, which accept 2” barrels in their focuser, a standard 2” barrel is included. For Schmidt-Cass grains (SCTs) that use a threaded connection to the focuser, a barrel with SCT threads is included. Both barrels thread onto the diagonal housing, providing a secure connection to the diagonal. The key specifications for a star diagonal are its reflectivity and its optical quality. This diagonal delivers top performance in both categories, with an over 99% reflective mirror and diffraction-limited optical quality. This ensures that virtually all the light collected by the telescope will reach the eyepiece without the diagonal affecting optical performance. Using a lower quality star diagonal can both dim the view and degrade optical quality. You can enjoy better views from your telescope by simply swapping out its diagonal for a premium one, like the Celestron Dielectric Star Diagonal.

Review: Is this a Quality Product .... Yes - This is an investment for any serious optical observer. If you have a CCD camera and want to see photons real-time instead. You may wish to look through this. If you have a Newtonian Reflector, you probably would not have looked at this item. Is it expensive ?, well, not if you want that extra brightness and contrast. Any SCT/Catadioptric user shall spot the difference. Be it improving a town view or dark sky experience, I would recommend. I have a Celestron Nexstar 8SE, and can see the difference on comparable nights of visual "seeing". I saw, noted, in other reviews, that difficult to use with a focal reducer (f6.3) Not so for me. This may be the 2 inch version. No problem with the 1.25 inch. My experience... Very good Comets/nebulae... brightness enhanced. Not an essential item, but I noticed the differnce.
Review: Great quality Diagonal - This diagonal is a hefty piece of kit that oozes quality. Everything about it feels well engineered. The Twist-Lock mechanism holds eyepieces firmly and is so easy to use in the dark. Although the diagonal can be screwed directly onto the back of my Celestron Evolution C9.25, I use it with the 2" nosepiece supplied so that I can also swap it onto my other scopes easily when required. In use, the views it provides are as good as, if not better, than any other 2" diagonal I've owned. The orange colour also matches the orange livery on the C9.25 scope and mount, so you know you look good in the dark ;-). Highly recommended.

## Features

- Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings
- Provides a 90° viewing angle, perfect for more comfortable viewing through refractor and cass grain-type telescopes
- 58 layers of dielectric coatings provide an over 99% reflective surface, ensuring the maximum amount of light collected by the telescope reaches the eyepiece
- Twist-lock keeps the eyepiece centered in the diagonal to provide better optical alignment
- Includes a Stepdown adapter, so the diagonal accepts eyepieces, Barlow lenses, threaded filters, and other accessories in both 2” and 1. 25” sizes

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07VNHDHFL |
| Best Sellers Rank | 294 in Telescope Accessories |
| Brand | Celestron |
| Colour | Black/Orange |
| Customer Reviews | 4.6 4.6 out of 5 stars (221) |
| Date First Available | 29 July 2019 |
| Focus type | Manual Focus |
| Guaranteed software updates until | unknown |
| Included components | Diagonal |
| Item model number | 93573 |
| Package Dimensions L x W x H | 16.7 x 16.1 x 11.1 centimetres |
| Package Weight | 0.75 Kilograms |
| Part number | 93573 |
| Product Dimensions L x W x H | 8 x 8 x 12 centimetres |
| Size | 2" Dielectric Mirror Diagonal, Twist-Lock |
| Style | Dielectric Star Diagonal |

## Images

![Celestron 93573 Dielectric Star Diagonal 2" with Twist Lock - Image 1](https://m.media-amazon.com/images/I/51ckdRQZUeL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Is this a Quality Product .... Yes
*by A***. on 18 April 2025*

This is an investment for any serious optical observer. If you have a CCD camera and want to see photons real-time instead. You may wish to look through this. If you have a Newtonian Reflector, you probably would not have looked at this item. Is it expensive ?, well, not if you want that extra brightness and contrast. Any SCT/Catadioptric user shall spot the difference. Be it improving a town view or dark sky experience, I would recommend. I have a Celestron Nexstar 8SE, and can see the difference on comparable nights of visual "seeing". I saw, noted, in other reviews, that difficult to use with a focal reducer (f6.3) Not so for me. This may be the 2 inch version. No problem with the 1.25 inch. My experience... Very good Comets/nebulae... brightness enhanced. Not an essential item, but I noticed the differnce.

### ⭐⭐⭐⭐⭐ Great quality Diagonal
*by M***H on 29 April 2020*

This diagonal is a hefty piece of kit that oozes quality. Everything about it feels well engineered. The Twist-Lock mechanism holds eyepieces firmly and is so easy to use in the dark. Although the diagonal can be screwed directly onto the back of my Celestron Evolution C9.25, I use it with the 2" nosepiece supplied so that I can also swap it onto my other scopes easily when required. In use, the views it provides are as good as, if not better, than any other 2" diagonal I've owned. The orange colour also matches the orange livery on the C9.25 scope and mount, so you know you look good in the dark ;-). Highly recommended.

### ⭐⭐⭐⭐⭐ Stunning Quality
*by L***S on 14 November 2023*

Besides being built like a tank, excellent quality and clearly a difference in light transmission. A MUST have. Expensive, but raises the bar for visual astronomy.

## Frequently Bought Together

- Celestron 93573 Dielectric Star Diagonal 2" with Twist Lock
- Celestron 93436 Luminous 2-Inch 2.5X Barlow Lens (Silver)
- Celestron Luminos Eyepiece – 2” 19mm

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-03*