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Celestron Omni 1.25" 4mm Eyepiece

050234933162

Celestron

4 in stock
£49.99
£49.99
Tax included. Shipping calculated at checkout.

Order before 3pm for next day delivery

Celestron Omni 4mm Eyepiece – 1.25" Barrel

Ultra-High Magnification Plössl Eyepiece for Lunar, Planetary & Double Star Observing

Push your telescope to its magnification limits with the Celestron Omni 4mm Eyepiece. Designed for high-power planetary and lunar viewing, this compact eyepiece delivers crisp, high-contrast images thanks to its quality 4-element Plössl construction and fully multi-coated optics. Whether you're observing fine crater detail on the Moon or resolving close double stars, the Omni 4mm gives you the clarity and performance to see more.

Key Features:

  • 4mm Focal Length – Delivers ultra-high magnification for detailed observations of planets and lunar features

  • 50° Apparent Field of View – Wide enough to comfortably observe fast-moving or tightly framed targets

  • 6mm Eye Relief – Suitable for brief high-magnification views; fold-down rubber eyecup helps reduce stray light

  • 4-Element Plössl Design – Offers a sharp, flat image field with minimal distortion and chromatic aberration

  • Fully Multi-Coated Optics – Improves light transmission and image brightness across all elements

  • Blackened Lens Edges – Reduces internal reflections to enhance contrast

  • Matte Aluminium Housing – Precision-machined with a two-step anodised finish for durability and anti-glare performance

  • Standard 1.25” Barrel – Threaded to accept 1.25" filters for added versatility

Best For:

  • Lunar Observing – Inspect crater walls, central peaks, and shadow transitions in sharp relief

  • Planetary Detail – Observe surface markings on Mars, Jupiter’s cloud belts, or Saturn’s ring gaps

  • Double Stars – Excellent for splitting tight binaries with fine resolution

Specifications:

Specification Value
Focal Length 4mm (0.16")
Apparent Field of View 50°
Eye Relief 6mm (0.24")
Optical Design 4-element Plössl
Barrel Size 1.25" (32mm)
Coatings Fully multi-coated
Filter Compatibility Yes – 1.25" threaded

Built to deliver precise, high-magnification performance, the Celestron Omni 4mm Eyepiece is ideal for advanced planetary and lunar observing sessions. Affordable, compact, and optically refined, it’s an essential tool for any astronomer aiming to push their telescope’s resolving power to its full potential.

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.
Celestron Omni 1.25" 4mm Eyepiece

£49.99

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