1.25" 20mm 50 degree Premium Plossl eyepiece

Get ready to take your stargazing to the next level without breaking the bank! Here at Sky's the Limit, we're thrilled to offer you our premium Plössl eyepieces. With a generous 50-degree apparent field of view, you'll see more of your favourite celestial objects than with typical Plössls.

Looking to expand your eyepiece collection but don't want to spend a fortune? You've found the perfect solution! Our Plössl eyepieces are not only affordable but are also packed with high-end features that provide bright, sharp, and contrasty images.

Key Features

• 20mm focal length

• For telescopes with 1.25" diameter focusers (most telescopes)

• 50-degree apparent field of view: See more of the night sky!

• Fully multi-coated on all glass surfaces: Enjoy superior light transmission for brighter views.

• Threaded for filters: Easily attach your favourite filters to enhance your observations.

• Fold-down eyecup: Find the perfect viewing position, whether you wear glasses or not.

• Ideal for deep-sky and planetary viewing: A versatile tool for exploring the cosmos.

Need a little guidance?

Many beginners ask us “How much magnification will that give me?”, often imagining that the higher the number, the better the view. A 20 mm eyepiece is a great way to show why that isn’t always the case. Because magnification is simply the telescope’s focal length divided by the eyepiece focal length, a 1,000 mm telescope produces around 50× with a 20 mm eyepiece — a level of power that feels calm, bright, and wonderfully forgiving. At this magnification, the Moon looks crisp and beautifully framed, star clusters begin to open up into rich sprays of individual stars, and planets sit neatly in the field without racing away every time you breathe near the telescope.

Manufacturers often quote a “maximum magnification” equal to about twice the aperture in millimetres, but that number is more fantasy than guidance. To reach those extremes you need perfect seeing, perfect collimation, and perfect optics, and even then the image is usually soft and unstable. A 20 mm eyepiece sits comfortably below that unrealistic limit, which is exactly why it performs so well. The field of view stays wide and easy to navigate, the image remains bright and sharp, and the telescope tracks smoothly without amplifying every tiny vibration or shimmer in the atmosphere.

This is why a 20 mm eyepiece is often the ideal starting point for beginners and a dependable workhorse for experienced observers. It gives you a view that is bright, sharp, and steady, with just enough magnification to make objects interesting without sacrificing clarity or ease of use. At this focal length, the balance between detail, brightness, and stability is spot‑on — a reminder that the most enjoyable view is often the one that keeps everything crisp, comfortable, and beautifully controlled.