1.25" 18mm BST Starguider ED eyepiece
£49.49£43.00
Out of stock
Ready to see the cosmos in stunning detail without a cosmic price tag? Our Starguider ED eyepieces are your ticket to breathtaking views! Say goodbye to washed-out images and hello to vibrant, high-contrast celestial wonders—all from the comfort of your own backyard.
We're not just selling eyepieces; we're helping you fall in love with the night sky all over again.
Here's why these are a must-have for any stargazer:
Exceptional Clarity: Thanks to two separate ED glass elements, you'll see true colours with astonishingly low chromatic aberration.
Massive Field of View: A wide 60-degree field of view makes it feel like you're floating through space, with sharp, flat, and distortion-free views from edge to edge.
High Contrast: Every air-to-glass surface is fully multicoated, delivering the kind of deep, dark skies that make faint nebulae and distant stars pop!
Comfortable & Convenient: With a 16mm eye relief and a twist-up eyecup, they're unbelievably comfortable, especially for glasses wearers.
Built to Last: A sturdy rubber-clad body and capture ring nosepiece ensure a secure fit and years of reliable performance.
Easy to Use: Colour-coded rings and clear lettering mean you'll find the right eyepiece in the dark without a hitch.
Don't miss out on seeing the universe as it was meant to be seen. Order yours today and prepare to be amazed!
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Key Specs:
Focal length: 18mm
Field of View: 60°
Eye Relief: 16mm
Eye Lens: Large 21mm
Materials: 6 element with two separate ED glass elements, rubber clad body
Weight: 182g
Features: Threaded for 1.25" filters, twist-up eyecups, blackened lens edges, capture ring nosepiece.
Need some guidance or advice about BST Starguiders?
Why I might want to upgrade to these eyepieces
Many beginners start with the question “Which eyepiece should I upgrade first?”, often assuming that magnification is the main thing that changes. In reality, the biggest improvement comes from optical quality and comfort, and that’s exactly why the BST Starguider ED eyepieces are such a transformative step up from basic Plössls. Plössl eyepieces typically have a narrow field of view and short eye relief, especially at shorter focal lengths, which can make high‑power observing feel cramped and uncomfortable. The BST Starguider ED range immediately solves those problems: they offer a 60° apparent field of view, far wider than a Plössl’s 50°, and they maintain long, comfortable eye relief even at high magnifications. The result is a view that feels more immersive, more relaxed, and far easier to use — especially for beginners who struggle with tiny eye lenses and tight viewing positions.
The optical upgrade is just as significant. Plössls are simple four‑element designs, and while they’re perfectly serviceable, they can suffer from edge softness, internal reflections, and chromatic aberration at faster focal ratios. BST Starguider ED eyepieces use extra‑low‑dispersion (ED) glass and more advanced internal baffling, which dramatically improves contrast and reduces colour fringing. Stars stay sharper across more of the field, planets show cleaner edges, and deep‑sky objects sit against a darker, more controlled background. It’s not subtle — the improvement is obvious the moment you look through one.
This is why BST Starguider ED eyepieces are widely recommended as the best first upgrade for anyone moving beyond the basic kit eyepieces supplied with most telescopes. They deliver a view that is wider, sharper, brighter, and more comfortable, without the price jump associated with premium brands. For beginners, they make observing easier; for experienced observers, they make it more enjoyable. They’re the perfect demonstration that the right eyepiece upgrade isn’t about chasing magnification — it’s about improving the quality of the view.
Why this might be just the right eyepiece you should get
Many beginners ask us “How much magnification will that give me?”, often assuming that higher magnification must mean a better view. An 18 mm eyepiece is a perfect way to show why the right magnification matters far more than the biggest number. Because magnification is simply the telescope’s focal length divided by the eyepiece focal length, a 1,000 mm telescope produces around 56× with an 18 mm eyepiece — a relaxed, bright, and beautifully stable level of power. At this magnification, the Moon shows crisp detail without rushing across the field, Jupiter and Saturn remain well‑defined, and open clusters and larger deep‑sky objects look spacious and richly populated.
Manufacturers often quote a “maximum magnification” equal to about twice the aperture in millimetres, but that figure is more marketing than reality. To reach those extremes you need perfect seeing, perfect collimation, and perfect optics, and even then the image is usually soft and unstable. The 18 mm eyepiece sits well below that unrealistic limit, which is exactly why it performs so well. It delivers enough magnification to make objects interesting, yet stays bright, sharp, and forgiving under typical UK conditions — a sweet spot that beginners quickly appreciate.
This is where the BST Starguider ED design makes a noticeable difference. A Plössl at 18 mm is usable, but it still suffers from a narrow field of view and limited eye relief, making the view feel more cramped and less comfortable. The BST, by contrast, offers a wide 60° field, long eye relief, and ED glass that keeps the image sharp and contrasty across more of the field. The result is a view that feels immersive, relaxed, and easy to track — ideal for beginners who are still learning to control the telescope smoothly.
The 18 mm BST Starguider ED is often described as a “comfort focal length” — bright, steady, and endlessly useful. It’s powerful enough to show real detail, yet wide and forgiving enough to make observing genuinely enjoyable every night. For beginners, it’s a confidence‑building upgrade that immediately improves the experience. For experienced observers, it’s a dependable medium‑low‑power workhorse. It’s the perfect demonstration that the best view comes from choosing the focal length that keeps everything bright, sharp, and beautifully easy to handle.