# 90-Degree Star Diagonal

Full listing title: 90-Degree Erecting Diagonal Fully Multi-Coated 1.25 Inch Star Diagonal Compact Angled Telescope Eyepiece Adapter for Astronomical Observation

- SKU: DCD-10001620842
- Price: 43.49 USD (excludes sales tax; tax calculated at checkout). Price valid until 2026-10-31.
- Availability: In stock (20 available; up to 10 per order)
- Shipping: free standard shipping, United States only; delivered in 12-22 days from order (leaves the warehouse within 4 business days)
- Estimated delivery if ordered today (2026-10-01): 2026-10-13 to 2026-10-23
- Returns: 30 days from delivery for unused items in original packaging; customer pays return shipping unless the item is damaged, defective or not as described; refund to the original payment method within 5 business days of receiving the return (https://suntekstore.com/returns/)
- Category: Music & Luthier (Arts & Entertainment > Hobbies & Creative Arts > Musical Instruments)
- Condition: new; brand: SuntekStore
- Package size: 20.61 x 16.7 x 6 cm (8.1 x 6.6 x 2.4 in)
- Weight: 0.39 kg (0.86 lb)
- In the box: 90 Degree Zenith Mirror ×1
- Product size: 10 x 8 x 8 cm (3.9 x 3.1 x 3.1 in)
- Color: Black
- Type: 90-degree erecting crystal diagonal
- Interface: Standard 1.25-inch (31.7 mm)
- Housing: Compact angled housing
- Features: Side insertion tube, optical viewing port, thumbscrew for securing inserted accessory
- Optical Coating: Fully multi-coated
- Use: Terrestrial viewing and astronomical observation

## Description

Product Identity: This 90-degree erecting angle adapter a precision telescope accessory designed to fit standard 1.25-inch telescope interfaces, delivering a compact viewing solution for compatible astronomical telescopes.
Core Function: As a 1.25-inch telescope diagonal, it redirects incoming light at a 90-degree angle to create a comfortable, ergonomic viewing position, reducing neck strain during extended observation periods.
Optical Features: The crystal diagonal features fully multi-coated optical elements housed in a compact angled black body, with a side insertion tube, optical viewing port, and thumbscrew to securely hold inserted eyepieces or accessories.
Practical Benefits: This telescope diagonal comes with cap pair covers to protect optical areas when not in use, and its thumbscrew locking mechanism allows quick, tool installation and adjustment for everyday use.
Intended Use: Built for both terrestrial viewing and astronomical observation, this 90-degree erecting crystal diagonal delivers views of landscapes, the Moon, planets, nebulae, and star clusters from a comfortable position.

This 90-degree erecting angle adapter a practical and reliable telescope accessory built to fit standard 1.25-inch telescope interfaces, making it a versatile addition to most compatible astronomical telescope setups. Its core function as a 1.25-inch telescope angle adapter to bend the light path by 90 degrees, so you can look down into the eyepiece instead of craning your neck at uncomfortable angles — a small change that makes difference during long stargazing periods or daytime landscape viewing. The diagonal itself features fully multi-coated optical elements that help deliver clear, sharp views, all housed in a compact angled black body with a side insertion tube and a dedicated optical viewing port. A thumbscrew on the housing lets you quickly and securely lock your eyepiece or other inserted accessories without needing additional tools, so you can swap components in seconds out in the field. As a user-friendly telescope diagonal, it also includes cap pair covers to protect the delicate optical areas from dust, dampness, and accidental scratches when the accessory is stored or not in active use. The small size factor and simple thumbscrew design make it a practical everyday piece of equipment that travels easily and sets up without hassle. Whether you are scanning distant landscapes during the day or turning your scope upward at night, this 90-degree erecting diagonal supports a wide range of viewing focuses on, from scenic terrestrial views to the Moon, planets, nebulae, and star clusters. By combining comfortable viewing with multi-coated optics, it helps you get more enjoyment out of every observation period with less physical strain.

Option: 90 Degree Zenith

## How to buy

Open https://suntekstore.com/buy/DCD-10001620842?qty=1 (change qty to 1-10). It redirects to Stripe Checkout; the shopper enters a US shipping address and pays there. No account or cart needed.

## Links

- Product page: https://suntekstore.com/p/DCD-10001620842/
- JSON: https://suntekstore.com/products/DCD-10001620842.json
- Image: https://suntekstore-img.sfo3.digitaloceanspaces.com/p/3b/3b884c532b61cfded344bb6cff87a65e1dc6e3b5.jpg
- Store policies: https://suntekstore.com/llms.txt