Celestron X-Cel LX 25mm vs Explore Scientific 20mm 62°: Which 1.25-Inch Eyepiece?
By TelescopesPlus - The #1 Online Store for Telescopes and Accessories | Published: 2026-11-05
Category: Comparisons
Compare the Celestron X-Cel LX 25mm and Explore Scientific 20mm 62° for deep-sky viewing. See field of view, eye relief, waterproofing, and price trade-offs.
Quick answer
Choose the Explore Scientific 20mm 62° if you want a wider apparent field and argon-purged waterproof construction for deep-sky sweeping. Choose the Celestron X-Cel LX 25mm if you prefer a lower magnification, fully multi-coated six-element design at a lower price.
Field of view and magnification: 62° vs 60°
The Explore Scientific 20mm offers a 62° apparent field of view, while the Celestron X-Cel LX 25mm provides a 60° apparent field. The difference in apparent field is small, but the 20mm focal length gives higher magnification than the 25mm, which can make small deep-sky objects like globular clusters appear larger and more detailed.
A 25mm eyepiece yields lower magnification and a larger exit pupil, which many observers find helpful for faint, extended nebulae and for framing large open clusters. The 20mm sits slightly closer in, trading some true field for a bit more image scale.
Waterproofing and optical construction
The Explore Scientific 20mm is argon-purged and waterproof, which protects internal optics from moisture and dust over time. The Celestron X-Cel LX 25mm uses six fully multi-coated optical elements for maximum light transmission, but the catalog does not list waterproofing for this model.
If you observe in humid climates or near dew-prone locations, the sealed construction of the Explore Scientific may offer extra peace of mind. The Celestron's multi-coatings are aimed at bright, sharp views, especially for planetary work, according to the catalog description.
Price and value trade-off
At catalog prices, the Celestron X-Cel LX 25mm is the lower-cost option, while the Explore Scientific 20mm carries a higher price but adds waterproofing and a slightly wider apparent field. Neither eyepiece includes supplied eye-relief figures in the catalog, so if you need long eye relief for glasses, check the manufacturer's specifications before buying.
Key trade-offs
- Field of view vs magnification: The Explore Scientific gives 62° apparent field at 20mm; the Celestron gives 60° at 25mm. The 20mm shows more magnification, while the 25mm shows a wider true field for the same telescope. Decide whether you value image scale or maximum framing more.
- Waterproofing vs multi-coatings: The Explore Scientific is argon-purged and waterproof; the Celestron is fully multi-coated but not listed as waterproof. Choose the sealed eyepiece for humid or dewy environments, or the multi-coated one for bright, sharp planetary views. Check your local climate and primary targets before deciding.
- Price vs features: The Celestron X-Cel LX 25mm is priced lower, while the Explore Scientific 20mm costs more but adds waterproofing and a slightly wider apparent field. Neither catalog listing provides eye-relief measurements. If you wear glasses, confirm eye relief from the manufacturer before purchase.
Product facts
- Explore Scientific 20 mm 62º Argon-Purged Waterproof Eyepiece - 1.25" - EPWP6220LE-01: 20mm focal length with a 62° apparent field of view and argon-purged waterproof construction. The slightly wider field and sealed body make it a strong low-power deep-sky choice for damp observing conditions.
Explore Scientific 20 mm 62º Argon-Purged Waterproof Eyepiece - 1.25" - EPWP6220LE-01 - Celestron X-Cel LX 25 mm 1.25" Eyepiece - 93426: 25mm focal length with six fully multi-coated optical elements and a 60° apparent field of view. The lower magnification and multi-coatings favor wide-field framing and bright, sharp views at a lower price.
Celestron X-Cel LX 25 mm 1.25" Eyepiece - 93426
Which eyepiece is right for you?
Best for
- Deep-sky observers who want a wider apparent field and waterproof construction
- Observers in humid or dew-prone locations who value sealed optics
- Those willing to pay more for added durability and a slightly wider view
Not for
- Budget-conscious buyers who want a lower-cost low-power eyepiece
- Observers who prefer the lowest magnification for the widest true field
- Planetary viewers who prioritize fully multi-coated elements over waterproofing
