Celestron 1.25" Oxygen III Narrowband Filter

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Celestron

1 in stock
£114.99
£114.99
Tax included. Shipping calculated at checkout.

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Celestron 1.25” OIII Narrowband Filter

Reveal Hidden Nebula Details with Exceptional Contrast

The Celestron 1.25” OIII (Oxygen-III) Narrowband Filter is specially designed to isolate only the two critical doubly-ionised oxygen emission lines at 496nm and 501nm—the spectral signature of many planetary and emission nebulae. By blocking the rest of the visible spectrum, this filter dramatically improves contrast, allowing faint nebulosity to stand out against a pitch-black sky.

Ideal for Observing Iconic Nebulae

  • Enhances visibility of subtle structure in nebulae like the Veil, Ring, Dumbbell, Crescent, and Orion

  • Cuts through light pollution and moonlight for improved deep-sky performance

  • Perfect for urban observers or dark-sky trips alike

Advanced Optical Coating Technology

  • Utilises a vacuum-deposited, ultra-hard multilayer coating

  • Effectively blocks the visual spectrum from 400nm to 700nm, isolating only OIII light

  • Prevents colour fringing and halos around bright stars—common issues with lower-grade filters

  • Delivers clean, high-contrast views without distortion

Built for Durability and Compatibility

  • Standard 1.25” filter size, fits most telescope eyepieces and filter wheels

  • Precision-machined anodised aluminium housing ensures long-term reliability

For amateur astronomers looking to bring out the finest detail in nebulae—especially under light-polluted skies—the Celestron 1.25” OIII Narrowband Filter is a valuable upgrade to your optical toolkit.

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 1.25" Oxygen III Narrowband Filter

£114.99

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