1.25" 5mm BST Starguider ED eyepiece
£48.99£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!
Compare & Save:
FLO: £55.00 + p&p
365: £53.00 + p&p
Sky's the Limit: £49.49 + FREE p&p 🚀
Key Specs:
Focal length: 5mm
Field of View: 60°
Eye Relief: 16mm
Eye Lens: Large 21mm
Materials: 6 element with two separate ED glass elements, rubber clad body
Weight: 215g
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.
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 perhaps I shouldn't upgrade to this eyepiece
Many beginners ask us “How much magnification will that give me?”, often assuming that higher magnification automatically means a better view. A 5 mm eyepiece is a great way to show why that isn’t always true. Because magnification is simply the telescope’s focal length divided by the eyepiece focal length, a 1,000 mm telescope produces around 200× with a 5 mm eyepiece — a level of power that can be genuinely useful, but also demanding. At this magnification, the Moon shows dramatic crater detail, planets reveal belts, rings, and subtle structure, and tight double stars begin to split cleanly. It’s exciting, but it’s also the point where the atmosphere starts to have a real say in what you can see.
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 often soft or unstable. At 5 mm, you’re not in the frightening territory of the 3.2 mm, but you’re definitely close enough that every wobble, vibration, and shimmer of turbulence becomes noticeable. The image is still bright enough to be enjoyable, but it’s less forgiving than at medium powers, and beginners can be surprised by how quickly objects drift out of view or how sensitive the telescope becomes to touch.
This is where the BST Starguider ED design really helps. Unlike a Plössl at this focal length — which would have a tiny eye lens and painfully short eye relief — the BST offers a comfortable 60° field of view, long eye relief, and ED glass that keeps the image sharp and controlled. It makes high magnification far more accessible, especially for those still learning to track, focus, and manage the telescope at higher powers.
The 5 mm eyepiece is best thought of as a high‑power tool that rewards patience. It’s not as extreme or temperamental as the 3.2 mm, but it still teaches the important lesson that magnification is a trade‑off: as the image gets larger, it also becomes dimmer, softer, and more sensitive to the atmosphere. Used on steady nights, it can deliver superb planetary and lunar detail — but it’s most enjoyable when beginners understand what high magnification can and cannot do.