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Buying Guide · Eyepieces 2026

Telescope Eyepiece Types Guide 2026: Find Your Perfect View

The eyepiece is the most impactful upgrade you can make to your telescope. A $50 eyepiece on a modest scope can outperform the stock eyepiece that came with a premium telescope. Here is how to understand eyepiece types, specifications, and what works best for your observing style.

Common Types

5 Designs

Plossl to Ethos

Focal Lengths

4mm-40mm

Magnification range

AFOV Range

40°-100°

Apparent field

Price Range

$15-$500+

Per eyepiece

By Elena Reyes Published: Updated: Editorial Standards
Elena Reyes — Senior Science Editor

Elena Reyes

Senior Science Editor

Covers NASA missions, space science discoveries, and astronomical events for Telescope Advisor. Translates complex astrophysical research into practical insights for backyard observers. Based in the San Francisco Bay Area.

Content reviewed by our editorial team. Research and drafting assisted by AI to ensure unbiased, data-driven analysis. Learn more about our editorial process.



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Eyepiece Basics: What the Numbers Mean

Every eyepiece has three key specifications that determine what you will see and how comfortable the view is.

Focal length (mm): This determines magnification when paired with your telescope. Divide your telescope's focal length by the eyepiece's focal length to get magnification. A 900mm telescope with a 20mm eyepiece gives 45x. With a 10mm eyepiece, 90x. Shorter focal lengths = higher magnification.

Apparent field of view (AFOV): How wide the view looks through the eyepiece. Standard Plossl eyepieces offer 50-52°. Wide-angle designs offer 60-70°. Ultra-wide designs (Tele Vue Ethos) offer 100° — like looking through a porthole. Wider AFOV provides more immersive views and makes finding targets easier.

Eye relief (mm): The distance your eye needs to be from the eyepiece to see the full field. Longer eye relief (15-20mm) is better for eyeglass wearers. Short eye relief (5-10mm) is common on high-power Plossls and can be uncomfortable. If you wear glasses, look for eyepieces with at least 15mm of eye relief.



Plossl Eyepieces — The Standard

The Plossl (pronounced "ploss-uhl") is the most common eyepiece design, found in virtually every telescope's included accessory kit. It uses a four-element, two-group design that delivers sharp, well-corrected images at an affordable price. Most Plossls offer a 50-52° apparent field of view — comfortable but not immersive. Eye relief is generally adequate at medium focal lengths (10-20mm) but becomes tight at short focal lengths (under 10mm).

Plossl eyepieces are an excellent choice for budget-conscious observers, especially in medium focal lengths (12-25mm). Celestron's Omni Plossl series and Meade's Series 4000 are well-regarded for their price. The main limitation is the narrow field — at 50°, you get a "keyhole" view compared to modern wide-angle designs. For planetary observing, however, the narrower field is less important because planets are small targets anyway.

Best Budget Plossl Set
Celestron Omni Plossl eyepiece

Celestron Omni Plossl Eyepiece Set

52° AFOVFully Multi-Coated

Celestron's Omni Plossl series offers excellent optical quality at a budget-friendly price. Fully multi-coated optics, 52° apparent field, and rubber eyecups. Available individually or as a set covering 4mm to 32mm. The 32mm Plossl is particularly good for wide-field deep-sky on longer focal-length telescopes.

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Wide-Angle Eyepieces — 60° to 82°

Wide-angle eyepieces are the most impactful upgrade for most observers. Jumping from 50° to 70° AFOV makes the view dramatically more immersive — objects float in black space rather than feeling like you are looking through a tube. The best wide-angle eyepieces use 6 to 8 elements in complex groups to maintain sharpness across the wider field.

Best Value Wide-Angle Eyepiece
Celestron X-Cel LX 9mm eyepiece

Celestron X-Cel LX 9mm

60° AFOV20mm Eye ReliefFully Multi-Coated

The X-Cel LX series strikes the best balance between price and performance in the wide-angle category. With 60° apparent field, 20mm of eye relief (eyeglass-friendly), and fully multi-coated optics, these eyepieces deliver sharp, contrasty views across the entire field. The twist-up eyecup with click-stop positions is comfortable and blocks stray light effectively.

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Barlow Lenses — Double Your Eyepiece Collection

A Barlow lens is an optical accessory that increases the effective focal length of your telescope, thereby increasing magnification with any eyepiece. A 2x Barlow doubles magnification — a 20mm eyepiece becomes effectively a 10mm eyepiece. This effectively doubles your eyepiece collection at a fraction of the cost of buying additional eyepieces.

The best Barlows use 2 to 4 elements with multi-coatings to maintain image quality. A good 2x Barlow can actually improve the performance of budget eyepieces by spreading the light cone over a larger field, reducing edge aberrations. Celestron's Omni 2x Barlow and Tele Vue's 2x Powermate are excellent choices at different price points.

Celestron Omni 2x Barlow lens

Celestron Omni 2x Barlow

2xFully Multi-Coated

The Celestron Omni 2x Barlow is an affordable, well-crafted Barlow that works with 1.25-inch eyepieces. The fully multi-coated optics maintain contrast and resolution. It includes a removable lens element that converts to a 1.5x Barlow when threaded directly onto an eyepiece — useful for intermediate magnifications. Solid build with a chrome barrel and rubber grip.

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Frequently Asked Questions

What eyepiece type gives the best view?

For the best balance of quality and cost, wide-angle eyepieces (60-70° AFOV) from Celestron X-Cel LX or Explore Scientific 82° series offer the most immersive views. For planetary observing where field width matters less, Plossl eyepieces deliver excellent contrast at lower cost.

What is the best focal length eyepiece for a beginner?

A 20mm or 25mm eyepiece is the best starting point. It provides moderate magnification (35-50x on most telescopes) with a wide, bright field that makes finding targets easy. Add a 10mm for higher power on planets and the Moon, and a 2x Barlow to double your options.

Are expensive eyepieces worth the money?

At the budget level ($20-50), the improvement over stock eyepieces is significant. At the mid-range ($80-150), you get wider fields, better coatings, and more comfortable eye relief. Premium eyepieces ($200-500+) offer marginal optical gains for most observers — the law of diminishing returns applies strongly after $150.