--- product_id: 145711656 title: "93573 Dielectric Star Diagonal 2\" with Twist Lock" brand: "celestron" price: "€ 415.83" currency: EUR in_stock: true reviews_count: 13 category: "Celestron" url: https://www.desertcart.gr/products/145711656-93573-dielectric-star-diagonal-2-with-twist-lock store_origin: GR region: Greece --- # 90° twist-lock viewing angle 99%+ light reflectivity 58-layer dielectric coatings 93573 Dielectric Star Diagonal 2" with Twist Lock **Brand:** celestron **Price:** € 415.83 **Availability:** ✅ In Stock ## Summary > 🔭 Elevate your stargazing game—see more, see sharper, see smarter! ## Quick Answers - **What is this?** 93573 Dielectric Star Diagonal 2" with Twist Lock by celestron - **How much does it cost?** € 415.83 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/145711656-93573-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 - • **Comfort Meets Precision:** 90° viewing angle reduces neck strain while maintaining diffraction-limited optical quality. - • **Versatile Compatibility:** Includes stepdown adapter for seamless use with both 2” and 1.25” eyepieces and accessories. - • **Effortless Eyepiece Security:** Twist-lock mechanism centers and secures eyepieces without scratches—upgrade your setup with confidence. - • **Built to Last, Backed to Trust:** Machined anodized aluminum body with 2-year US warranty and expert support from Celestron. - • **Brilliant Clarity, Maximum Light:** 58 layers of dielectric coatings deliver over 99% reflectivity for stunningly bright, sharp views. ## Overview The Celestron 93573 Dielectric Star Diagonal 2" with Twist Lock enhances your telescope’s performance by delivering over 99% light reflectivity through 58 dielectric coating layers. Its 90° viewing angle and twist-lock eyepiece holder provide comfortable, secure, and precise viewing. Compatible with both 2” and 1.25” eyepieces via included adapters, this premium diagonal is crafted from durable anodized aluminum and backed by a 2-year US warranty, 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: Better than my original star diaganol - I do not have an expensive telescope (a 5" Maksutov) but the telescope glass is pretty good. The problem is the 5" aperture which only allows so much light to come in. This means the optics attached to the telescope need to be as high quality as you can afford so you can get all the light possible to the eyepiece. For this I purchased Celestron's dielectric star diagonal because it is much better than the original cheap diaganol. It is easy to work with, too, because of the special twist lock it has which lets me change eyepieces easily and safely. I'm surprised more amateur astronomers don't start with buying a better diagonal like this one. When I upgrade my telescope the Celestron Star Diaganol can work with the new scope too. Review: For me, this was a much needed improvement. - I have the Celestron Evolution 8 telescope. It came with the 1.25" diagonal and it worked. I had been reading that the 2" would increase the viewing area (along with a 2" eyepiece) so I decided to take a gamble and I'm glad I did. Not only did it increase the viewing area, it made the images sharper. Again, don't know if it is the diagonal or the 2" Luminos eyepiece (31mm) but I am very happy with this upgrade. ## 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 - UNBEATABLE WARRANTY & SUPPORT: Buy with confidence from Celestron, a leading telescope brand in California since 1960. Your purchase includes a 2-Year US Warranty and unlimited support from our team of US-based experts. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07VNHDHFL | | Best Sellers Rank | #4 in Telescope Diagonals | | Customer Reviews | 4.6 4.6 out of 5 stars (239) | | Date First Available | July 24, 2019 | | Item Weight | 1.64 pounds | | Item model number | 93573 | | Manufacturer | Celestron | | Product Dimensions | 3.15 x 3.15 x 4.72 inches | ## Images ![93573 Dielectric Star Diagonal 2" with Twist Lock - Image 1](https://m.media-amazon.com/images/I/51ckdRQZUeL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Better than my original star diaganol *by T***R on September 11, 2024* I do not have an expensive telescope (a 5" Maksutov) but the telescope glass is pretty good. The problem is the 5" aperture which only allows so much light to come in. This means the optics attached to the telescope need to be as high quality as you can afford so you can get all the light possible to the eyepiece. For this I purchased Celestron's dielectric star diagonal because it is much better than the original cheap diaganol. It is easy to work with, too, because of the special twist lock it has which lets me change eyepieces easily and safely. I'm surprised more amateur astronomers don't start with buying a better diagonal like this one. When I upgrade my telescope the Celestron Star Diaganol can work with the new scope too. ### ⭐⭐⭐⭐⭐ For me, this was a much needed improvement. *by J***X on January 16, 2024* I have the Celestron Evolution 8 telescope. It came with the 1.25" diagonal and it worked. I had been reading that the 2" would increase the viewing area (along with a 2" eyepiece) so I decided to take a gamble and I'm glad I did. Not only did it increase the viewing area, it made the images sharper. Again, don't know if it is the diagonal or the 2" Luminos eyepiece (31mm) but I am very happy with this upgrade. ### ⭐⭐⭐⭐⭐ Nice first upgrade *by S***A on August 31, 2025* Great quality and a nice improvement over the stock one that came with my telescope. Fit perfectly into a celestron 6se. ## 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 --- ## 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.gr/products/145711656-93573-dielectric-star-diagonal-2-with-twist-lock](https://www.desertcart.gr/products/145711656-93573-dielectric-star-diagonal-2-with-twist-lock) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-04-25*