Sky-Watcher Deluxe 1.25" Dielectric 90° Star Diagonal

SKY20967

SkyWatcher

6 in stock
£109.00
£109.00
Tax included. Shipping calculated at checkout.

Order before 3pm for next day delivery

SkyWatcher Deluxe 1.25" Dielectric 90° Star Diagonal

Enhance your telescope's performance and comfort with the SkyWatcher Deluxe 1.25" Dielectric 90° Star Diagonal. Designed for both astronomical and terrestrial observations, this premium star diagonal offers outstanding reflectivity, improved contrast, and an ergonomic viewing angle—ideal for extended sessions at the eyepiece.

Key Features

Exceptional Reflectivity
Utilises dielectric coatings to reflect up to 99% of incoming light, preserving image brightness and enhancing contrast for deep-sky and planetary viewing.

Comfortable 90° Viewing Angle
Redirects the optical path by 90°, offering a more comfortable viewing position, especially when your telescope is pointed near the zenith.

High-Quality Construction
Crafted with lightweight yet durable materials, this diagonal is made to last. It’s ideal for use with 1.25" focusers and eyepieces, ensuring compatibility with a wide range of telescopes.

Dielectric Coatings for Performance
The high-reflectivity multi-coatings on optical surfaces ensure maximum image brightness, sharpness, and reduced light loss—critical for high-contrast lunar and planetary detail.

Versatile for All Viewing Applications
Perfect for both astronomical observing and terrestrial viewing, thanks to its high-precision optical build.

Specifications

  • Barrel Size: 1.25" (31.7 mm)

  • Reflectivity: Up to 99%

  • Viewing Angle: 90 degrees

  • Coatings: Dielectric high-reflectivity multi-coatings

  • Applications: Astronomical and terrestrial

  • Material: Lightweight and durable construction

Summary

The SkyWatcher Deluxe 1.25" Dielectric 90° Star Diagonal is an essential upgrade for any visual astronomer seeking brighter, crisper views and more ergonomic observing. Whether you're scanning the night sky or observing landscapes in daylight, this diagonal delivers performance, precision, and comfort in equal measure.

Shipping Options

Fast & Reliable UK Delivery

We offer flexible delivery options across the UK, with free shipping available on qualifying orders.

  • FREE Next Working Day Delivery (Mon–Fri)
    On all orders £300 and over
  • FREE Express Delivery (1–3 Working Days)
    On orders £49.99 – £299.99
  • Express Delivery – £3.99
    On orders under £49.99
  • Standard Delivery (2–4 Working Days) – £2.99
    A great value option for smaller orders
  • Priority Shipping – £8.99
    A fully tracked, guaranteed delivery service, including Saturday delivery options

Order Fulfilment

Some items, as clearly stated on the product page, may be fulfilled directly by our partners or manufacturers. In these cases, your order will be shipped to you straight from the brand’s warehouse. This helps us provide a wider range of specialist equipment and may result in slightly different delivery times.

Returns Policy

If something isn’t right, we’ll always try to help.

  • Unused items in “as new” condition can usually be returned within the statutory cooling-off period
  • Please contact us before sending anything back so we can advise on the safest way
  • For unwanted items, return shipping is your responsibility, and original shipping may be deducted where applicable
  • If a product is faulty or damaged, we’ll arrange repair, replacement or refund in line with your consumer rights — and we’ll cover reasonable return costs

Telescope shipping is expensive, and specialist — avoidable returns really do impact our business, so we always encourage customers to ask questions before buying. We’re here to help you get it right first time.

Your statutory rights are not affected.
Sky-Watcher Deluxe 1.25" Dielectric 90° Star Diagonal

£109.00

Does it come with a warranty?

All our products are UK stock so come with manufacturers warranty

What happens if I don't like it?

We always want you to be happy with your purchase — so if you’re unsure, please ask us first. We’re always happy to give honest advice before you buy.

If the product arrives and you simply decide it isn’t for you, you can usually return it within the cooling-off period — as long as it’s unused, in perfect condition, and returned with all original packaging and accessories.

Because telescopes and optical equipment are large, delicate and expensive to ship, you’ll need to cover the cost of sending it back, and if we originally subsidised delivery, we may deduct our outbound shipping costs from your refund.

We’re a small specialist business, and unnecessary returns genuinely hurt us — so if you’re unsure at all, please talk to us first. We’d rather help you choose the right item than process a return.

How fast is shipping?

We aim to ship in-stock items as quickly as possible.

  • Most in-stock orders dispatch within 1–2 working days
  • Delivery usually takes 1–3 working days after dispatch (UK mainland)
  • Heavier / oversized items and special orders may take a little longer

You’ll receive tracking details as soon as your order is on its way.

Astronomy equipment often requires specialist packing and trusted couriers — we do this to keep your gear safe, not to slow things down. If you need something urgently, just ask and we’ll do our best.

What's the returns policy?

If something isn’t right, we’ll always try to help.

  • Unused items in “as new” condition can usually be returned within the statutory cooling-off period
  • Please contact us before sending anything back so we can advise on the safest way
  • For unwanted items, return shipping is your responsibility, and original shipping may be deducted where applicable
  • If a product is faulty or damaged, we’ll arrange repair, replacement or refund in line with your consumer rights — and we’ll cover reasonable return costs

Telescope shipping is expensive, and specialist — avoidable returns really do impact our business, so we always encourage customers to ask questions before buying. We’re here to help you get it right first time.

Your statutory rights are not affected.

What are your opening hours?

Monday: 9.00am - 5.00pm
Tuesday: 9.00am - 5.00pm
Wednesday: 9.00am - 5.00pm
Thursday: 9.00am - 5.00pm
Friday: 9.00am - 5.00pm
Saturday: 9.00am - 5.00pm
Sunday: Closed