Astronomy Eyepiece
Eyepieces designed for use with astronomical telescopes, offering magnification, field of view and optical clarity for planetary and deep-sky observation. Available in 1.25-inch and 2-inch barrel sizes with multi-coated optics and metal housings.
Astronomy eyepieces are optical components that fit into the focuser of a telescope to magnify the image formed by the objective lens or mirror. This range includes Plossl designs with 4-element optics, aspheric wide-angle models with 58-62 degree fields of view, and Barlow magnifiers with full metal construction. All are compatible with standard 1.25-inch and 2-inch focusers and diagonals. The 1.25-inch models feature multi-coated lenses, blackened lens edges to reduce internal reflections, and include dust covers and rubber eye patches. The 2-inch model has a 56mm focal length and a 47.8mm field diaphragm for wider views.
Every Astronomy Eyepiece In Stock
All 8 items in this category, listed in full.
Astronomical Telescope Eyepiece 3X Magnifier Barrow Full Metal
View Details
1.25 Inch 2.5 -9mm Astronomical Telescope TMB Eyepiece 58 Degree
View Details
1.25'' 4mm 10mm 23mm 62 Degrees Astronomical Telescope Eyepiece
View Details
1.25" Plossl Eyepiece 3.6mm-40mm for 1.25" Astronomy Telescope
View Details
1.25 Inch 2X 3X 5X Extender Four-piece Green Film Lens Metal
View Details
2 Inches 50 Degree 56mm Metal Parfocal Eyepiece Fully Astronomical
View Details
31.75mm Eyepiece to C-mount Fixed Telescope Eyepiece Adapter
View Details
31.75mm Eyepiece to C-mount Adjustable Telescope Adapter
View DetailsWhat Goes Wrong Without the Right Astronomy Eyepiece
- A telescope with no eyepiece cannot be used for visual observation
- Low-quality eyepieces produce chromatic aberration and edge distortion
- Non-parfocal eyepieces require refocusing when switching between magnifications
- Eyepieces without multi-coating reduce contrast and increase glare under bright skies
- Eyepieces with small field diaphragms limit the visible area of the sky
Who Buys From This Category
- Amateur astronomers using refractor or reflector telescopes
- Educational institutions teaching observational astronomy
- Astro-photography setups requiring consistent focus across magnifications
- Telescope dealers offering upgrade kits for existing instruments
- Hobbyists doing planetary or deep-sky observation with standard focusers
Why These Items
- Multi-coated 2-element and 4-element optics reduce internal reflections and improve contrast
- Blackened lens edges minimize flare and ghosting in bright or low-contrast scenes
- 1.25-inch and 2-inch barrel sizes fit standard telescope focusers and diagonals
- Plossl design delivers sharp images across the field with long eye relief
- Aspheric wide-angle models offer 58-62 degree fields of view for better sky coverage
- Metal housings with threaded filter rings allow use with standard astronomy filters
- Included dust covers and rubber eye patches protect optics and improve viewing comfort
Where These Are Used
- Observing Jupiter's cloud bands with a 4mm Plossl eyepiece for high magnification
- Viewing the Orion Nebula with a 23mm 62-degree wide-angle eyepiece for a broader field
- Using a 3X Barlow lens to double the magnification of a 10mm eyepiece on a planetary telescope
- Switching between 6mm and 12.5mm eyepieces without refocusing due to parfocal design
- Mounting a 31.75mm to C-mount adapter to connect a telescope to a digital camera
Before You Order
- Confirm the barrel size (1.25 inch or 2 inch) of your telescope focuser before ordering
- Check whether your telescope has a filter thread on the eyepiece barrel if using filters
- Use a 2-inch eyepiece only if your telescope has a 2-inch focuser and sufficient back focus
- Match the focal length to your desired magnification: shorter focal length = higher magnification
- Ensure the eyepiece's field of view matches your observing goals (narrow for planets, wide for deep sky)
Frequently Asked Questions
What barrel size do I need for my telescope?
Most amateur telescopes use 1.25-inch focusers. If your telescope has a 2-inch focuser, you can use 2-inch eyepieces for wider fields. Check the diameter of your focuser or diagonal.
Can I use a 1.25-inch eyepiece in a 2-inch focuser?
Yes, a 1.25-inch eyepiece can be used in a 2-inch focuser with an adapter, but the reverse is not possible without a reducer.
Are these eyepieces parfocal?
The 2-inch 56mm parfocal eyepiece is designed to be parfocal. Other models may not be, so refocusing may be needed when switching between them.
Do these eyepieces work with digital cameras?
Yes, the 31.75mm to C-mount adapters allow direct connection of a telescope to a digital camera for imaging.
What is the difference between Plossl and aspheric wide-angle eyepieces?
Plossl eyepieces offer sharp images across the field with 4-element optics. Aspheric wide-angle models have 3 focal lengths (4mm, 10mm, 23mm) and a 62-degree field of view for broader sky coverage.
Get A Price On Astronomy Eyepiece
Send the model numbers you are considering, or describe the task and let us shortlist them for you.