Celestron Ultima Edge 65° 15mm - 1.25"

An 8-Element Flat-Field Optical System

The Ultima Edge design uses an 8-element, 5-group lens configuration to correct for optical aberrations that typically soften stars at the edge of the field. This flat-field correction means you get sharp, pinpoint stars from the center all the way to the 19.6mm field stop. Fully multi-coated optics maximize light transmission, delivering bright, high-contrast views of faint deep-sky objects and subtle planetary details.

A 65° Apparent Field for Mid-Power Views

With a 65° apparent field of view, the Ultima Edge 15mm offers an immersive window that feels significantly wider than a standard Plössl without the extreme distortions of some ultra-wide designs. This focal length is a workhorse for many telescopes, providing enough magnification to resolve globular clusters like the Hercules Cluster (M13) or see cloud bands on Jupiter, while still being wide enough to frame smaller nebulae and galaxies.

16mm Eye Relief and Parfocal Design

Comfort is critical during long observing sessions, and the Ultima Edge 15mm provides 16mm of eye relief, allowing most eyeglass wearers to see the entire field of view. The fold-down rubber eyeguard helps position your eye correctly and blocks stray light. As a parfocal eyepiece, it allows you to switch between most other focal lengths in the Ultima Edge series with little to no refocusing, saving valuable time when observing.

• Parfocal Convenience: Swap between different magnifications quickly without losing focus, ideal for tracking objects or comparing views at different image scales.
• Lightweight Body: Machined from high-grade aluminum, the eyepiece weighs only 5.18 oz (147 g), preventing balance issues on most telescopes.
• Filter Ready: The 1.25" barrel is threaded to accept standard astronomy filters for enhancing views of nebulae or reducing glare from the Moon.

Ultima Edge 15mm vs. Low-Power Models: Magnification vs. Field

Choosing an eyepiece is about finding the right balance for your target. While a lower-power eyepiece like the 24mm Ultima Edge provides a wider true field of view for scanning large star fields, the 15mm model offers a distinct advantage for smaller targets.

• Celestron Ultima Edge 15mm: Delivers higher magnification, making it the superior choice for resolving fine details. This is the eyepiece for splitting tight double stars, observing craters along the Moon's terminator, or studying the Galilean moons as they transit Jupiter.
• Lower-Power Ultima Edge Eyepieces: These are better suited for framing large objects like the Andromeda Galaxy (M31) or the Orion Nebula (M42) in their entirety. However, they will not provide the image scale needed to see the finer structures that the 15mm can reveal.