Celestron Ultima Edge – 18mm Flat Field Eyepiece (1.25″)

Celestron Ultima Edge – 18mm Flat Field Eyepiece (1.25″)

Ultra-flat, wide-field eyepiece for immersive lunar, planetary & deep-sky observing

The Ultima Edge 18mm Flat Field Eyepiece is a premium Ultra Flat Field (UFF), parfocal 1.25″ eyepiece engineered for astronomers who want exceptional edge-to-edge sharpness, high contrast, and outstanding viewing comfort. With an advanced 8-element optical design, fully multi-coated lenses, and a generous 65° apparent field of view, this eyepiece delivers stunningly crisp and uniform images across the entire field—ideal for planets, the Moon, star clusters, nebulae, and galaxies.

Available from Modern Telescopes – India’s largest telescope network, the Ultima Edge 18mm is a superb choice for Newtonian reflectors, Dobsonians, refractors, Schmidt-Cassegrain (SCT), and Maksutov telescopes using standard 1.25″ focusers or star diagonals.

🌌 Ultra-Flat Field for Pinpoint Stars Edge to Edge

Designed to help you “see the whole picture,” the Ultima Edge series minimizes field curvature and optical distortion, producing razor-sharp stars from the center right to the edge of the view—even in faster optical systems.

• 18mm focal length offers an excellent balance of moderate magnification and wide true field

• 65° apparent field of view delivers immersive, space-walk-style observing

• Perfect for lunar landscapes, planetary detail, open and globular clusters, and compact deep-sky objects

🔭 Advanced 8-Element Optical Design

• 8 lens elements in 5 groups with proprietary optical design

• Fully multi-coated optics for maximum light transmission and contrast

• Bright, high-resolution views with excellent color fidelity

• Optimized for consistent performance across a wide range of telescope designs

👓 Exceptional Viewing Comfort

The Ultima Edge 18mm is especially comfortable for long observing sessions:

• Very generous 20mm eye relief – ideal for eyeglass wearers

• Fold-down rubber eyeguard for flexible eye placement

• Wide field of view without blackouts or eye strain

🛠 Precision-Machined Aluminum Body

Built to professional standards, the eyepiece housing is machined from high-grade aluminum with a black anodized finish. A molded rubber grip ring ensures secure, non-slip handling—even with gloves during cold night sessions.

• 1.25″ (31.75mm) barrel compatible with all standard focusers and diagonals

• Internally threaded barrel accepts standard 1.25″ filters (M28.5 × 0.6)

• Solid yet well-balanced weight for stable telescope handling

🔄 Convenient Parfocal Design

Observe more, adjust less. The Ultima Edge eyepieces are parfocal, allowing you to switch between Ultima Edge focal lengths with little to no refocusing, so you never lose precious observing time.

Note: The Ultima Edge 24mm is not parfocal. Parfocality applies only within the Ultima Edge series and not with eyepieces from other brands or lines.

📐 Technical Specifications

• Focal Length: 18mm

• Barrel Diameter: 1.25″ (31.75mm)

• Eyepiece Type: Wide-Field Flat Field

• Apparent Field of View: 65°

• Field Stop Diameter: 23.4mm

• Optical Design: Proprietary

• Lens Elements / Groups: 8 / 5

• Optical Coatings: Fully Multi-Coated

• Eye Relief: 20mm

• Parfocal: Yes (within Ultima Edge line)

• Filter Threads: 1.25″ (M28.5 × 0.6)

• Eye Guard: Fold-down rubber

• Body Material: Aluminum

• Weight: 7.4 oz (209.7g)

• Dimensions: 81 × 51 × 51 mm

⭐ Why Buy from Modern Telescopes?

✔ India’s largest and most trusted telescope & astronomy accessories store
✔ Authorized seller of genuine Celestron eyepieces
✔ Expert guidance for beginners and advanced astronomers
✔ Nationwide shipping and reliable after-sales support