What size telescope eyepiece do I need?

Most telescopes use either 1.25-inch or 2-inch eyepieces. The size depends on your telescope’s focuser, with 1.25-inch being the most common and 2-inch offering a wider field of view for deep-sky observation.

What is the difference between long and short focal length eyepieces?

Long focal length eyepieces provide lower magnification and a wider field of view, ideal for deep-sky objects like galaxies and nebulae. Short focal length eyepieces offer higher magnification, making them better for viewing planets and lunar details.

Are used telescope eyepieces a good option?

Yes, used telescope eyepieces can be a great way to save money while still getting high-quality optics. We carefully inspect all used eyepieces to ensure they meet performance standards before offering them for sale.

Which brand of telescope eyepiece is best?

Top brands like Televue, Celestron, and other premium manufacturers offer high-quality telescope eyepieces. Televue eyepieces are well known for their sharp optics and wide fields of view, making them a favorite among serious astronomers.

How do I calculate magnification with a telescope eyepiece?

To calculate magnification, divide your telescope’s focal length by the eyepiece’s focal length. For example, a 1000mm focal length telescope with a 10mm eyepiece provides 100x magnification.

What type of eyepiece is best for planetary viewing?

For planetary viewing, a short focal length eyepiece (typically under 10mm) provides high magnification, allowing you to see details like Jupiter’s cloud bands or Saturn’s rings. A good quality Plössl or ultra-wide-angle eyepiece enhances the experience.

Eyepieces

The specifications of your telescope are only half the equation—choosing the right eyepiece for your telescope is just as important for achieving the best viewing experience. Whether you're looking for new or used telescope eyepieces, the right focal length and field of view can make a significant difference in what you see.

Our selection includes a variety of telescope eyepieces for sale from trusted brands like Celestron, Televue, and more, available in 1.25” and 2” barrel sizes to fit various telescopes. Understanding how eyepiece focal length affects magnification is key—divide your telescope's focal length by the eyepiece's focal length to determine the magnification.

• For deep-sky objects like the Andromeda Galaxy with a large apparent diameter, a long focal length eyepiece with a wide field of view allows for stunning, low-magnification views while maintaining image brightness.
• For planetary viewing, a short focal length eyepiece with a small FOV provides high magnification for observing surface details like Jupiter’s Great Red Spot. You'll get a dimmer image, but since planets are already as bright as it is, this won't be an issue.

Explore our collection to find everything from new premium Televue eyepieces to affordable used telescope eyepieces, perfect for all levels of astronomy enthusiasts.

* Note: Almost all eyepieces come in 2" or 1.25" barrel-size forms.