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header-product DO-GSO SCT 90° 2" Dielectric Star Diagonal Mirror Socket
139.99 €

DO-GSO SCT 90° 2" Dielectric Star Diagonal Mirror Socket

DO-GSO SCT 90° 2" Dielectric Mirror Socket Photo 1

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DO-GSO SCT 90° 2" Dielectric Star Diagonal Mirror Socket

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DO-GSO SCT 90° 2" Dielectric Star Diagonal Mirror Socket

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Short description

The DO-GSO SCT 90° 2" dielectric mirror socket is an optical accessory designed for astronomical telescopes. It features a 90-degree viewing angle and a 2-inch barrel size, utilizing high-reflectivity dielectric coatings to maximize light transmission and image brightness. Ideal for comfortable eyepiece viewing with Schmidt-Cassegrain telescopes, ensuring durable and precise celestial observations.
Available for order: 6 pcs.
Warranty: 2 Years
SKU: 12769392
Manufacturer: No name
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Unisend LV

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Cost

1.99 €

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
24.11.2026 {{selectedOffer.officeDeliveryString}}
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27.11.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 0.79 kg)
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From 1.99 €
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36 months installment: from 3.89 euros per month
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Product information

Description

The DO-GSO SCT 90° 2" dielectric mirror socket is a precision optical accessory designed specifically for astronomical telescopes. Engineered to provide a comfortable 90-degree viewing angle, this star diagonal mirror socket enhances the viewing posture during extended celestial observation sessions. By integrating advanced dielectric coatings, the accessory maximizes light transmission and ensures superior image brightness, contrast, and clarity. It is built to fit Schmidt-Cassegrain telescopes seamlessly, offering a reliable connection for your optical equipment.

Advantages

The main advantage of this star diagonal is the application of high-reflectivity dielectric coatings, which reflect a significantly higher percentage of incoming light compared to standard aluminum mirrors. This results in brighter, sharper, and more detailed views of celestial objects such as the Moon, planets, and deep-sky targets. The robust construction ensures long-term durability and optical alignment stability, even with frequent use and transport. Additionally, the 2-inch barrel size accommodates large eyepieces, providing a wider apparent field of view for an immersive stargazing experience.

Suitable for

  • Astronomy enthusiasts using Schmidt-Cassegrain telescopes
  • Observing planets, the Moon, and deep-sky objects with 2-inch eyepieces
  • Comfortable zenith viewing during long night observation sessions

When it may not be suitable for refractor or Newtonian telescopes without specific adapters, this accessory is tailored primarily for Schmidt-Cassegrain optical systems. It may also be unnecessary for users exclusively utilizing basic 1.25-inch eyepieces without appropriate step-down adapters.

Key specifications

  • 90-degree viewing angle
  • 2-inch barrel size
  • High-reflectivity dielectric mirror coatings
  • Designed for Schmidt-Cassegrain telescopes

To use the dielectric star diagonal mirror socket, first remove any dust caps from both ends of the accessory. Insert the 2-inch barrel securely into the visual back or focuser of your Schmidt-Cassegrain telescope and tighten the retaining screws to lock it firmly in place. Next, insert your compatible 2-inch telescope eyepiece into the diagonal's holder and secure it accordingly. Adjust the focus using your telescope's focus knob until the celestial image appears sharp and clear.

What to consider before purchase

  • Verify that your telescope is a Schmidt-Cassegrain model or has a compatible 2-inch visual back
  • Check if your current eyepieces are 2-inch format or if you require reduction adapters
  • Ensure your telescope mount can handle the slight additional weight and optical path length
For optimal performance, always store the star diagonal in a dry, dust-free environment with its protective caps attached when not in use, and clean the optical surfaces only with specialized optical cleaning tools to prevent scratching the dielectric coatings.

Description

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Product comparison

The optical accessory DO-GSO SCT 90° 2" Dielectric Star Diagonal Mirror Socket is compared with other DO-GSO astronomical accessories: the diagonal mirror DIELECTRIC mirror bevel socket DO-GSO 90° 2" STD201, the coma corrector Coma corrector DO-GSO 2-inch for telescopes, the focal reducer Focal Reducer DO-GSO 0.5x 2", and the eyepieces DO-GSO Plossl 20mm 1.25-inch Eyepiece and DO-GSO Plossl 15mm 1.25-inch Eyepiece. While all these items enhance telescope setups, they perform completely different optical functions.

⚙️ The specifications comparison covers the accessory type, barrel size, viewing angle or focal length, and telescope compatibility.

Comparison parameterDO-GSO SCT 90° 2" Dielectric Star Diagonal Mirror SocketDIELECTRIC mirror bevel socket DO-GSO 90° 2" STD201Coma corrector DO-GSO 2-inch for telescopesFocal Reducer DO-GSO 0.5x 2"DO-GSO Plossl 20mm 1.25-inch EyepieceDO-GSO Plossl 15mm 1.25-inch EyepiecePractical significance
Device typeDiagonal mirrorDiagonal mirrorComa correctorFocal reducerEyepieceEyepieceEach accessory fulfills a unique optical role and cannot replace the others.
Barrel size2 inches2 inches2 inches2 inches1.25 inches1.25 inches2-inch accessories provide a wider light path compared to 1.25-inch alternatives.
Compatibility and purposeFor Schmidt-Cassegrain telescopesFor general astronomical setupsFor Newtonian telescopesFor general telescope setupsFor general observationsFor detailed observationsThe choice depends strictly on your telescope optical design and intended observing goals.

◎ The suitability and use case comparison helps determine which optical element matches your specific astronomy needs.

Use caseRecommended productWhy
Comfortable zenith viewing with a Schmidt-Cassegrain telescopeDO-GSO SCT 90° 2" Dielectric Star Diagonal Mirror SocketProvides a convenient 90-degree viewing angle and high light transmission specifically tailored for SCT optical tubes.
Upgrading standard 2-inch mirror setupsDIELECTRIC mirror bevel socket DO-GSO 90° 2" STD201Offers an equivalent 90-degree viewing angle and high-reflectivity coating for general optical systems.
Eliminating edge aberrations in Newtonian reflectorsComa corrector DO-GSO 2-inch for telescopesCorrects coma and ensures sharp images across the entire frame during astrophotography.
Expanding the field of view and reducing exposure timesFocal Reducer DO-GSO 0.5x 2"Decreases the focal length to capture wider celestial vistas.
Visual observations of the Moon, planets, and deep-sky targetsDO-GSO Plossl 20mm 1.25-inch Eyepiece or DO-GSO Plossl 15mm 1.25-inch EyepieceStandard 1.25-inch eyepieces designed to deliver clear magnification and viewing comfort.
The DO-GSO SCT 90° 2" Dielectric Star Diagonal Mirror Socket differs from the alternatives by functioning specifically as a 2-inch diagonal mirror for Schmidt-Cassegrain telescopes. It is most suitable for owners of SCT systems seeking enhanced viewing comfort at high angles and brighter images through dielectric coatings, whereas the alternative products serve entirely different functions such as aberration correction, focal length reduction, or magnification.
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Customer reviews

Customer questions

FAQ

How much does the DO-GSO SCT 90° 2" Dielectric Mirror Socket cost, and is it available for purchase?

The price is 139.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 24.11.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

Can DO-GSO SCT 90° 2" Dielectric Mirror Socket be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. We work with leading banks and leasing companies in Latvia, allowing you to make your purchase on convenient terms — with a minimal down payment and a repayment period from 3 to 36 months. You can apply for credit or installments for the DO-GSO SCT 90° 2" Dielectric Mirror Socket online, and the application process is as simple as possible:
  • Select the product on the website and add it to your cart;
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  • Receive a decision within a few minutes.
For more information about available payment options, interest-free installment terms, and credit conditions in Latvia, please visit the Payment page.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All No name products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized No name service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.
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