Celestron Ultima Edge 60° 10mm - 1.25"

A 60° Flat Field: Sharp Stars from Edge to Edge

The core of the Ultima Edge design is its flat-field correction, a feature typically found in much more expensive eyepieces. This 5-element, 4-group system corrects for field curvature, ensuring that stars at the edge of the 60° apparent field of view are as sharp and point-like as those in the center. The result is a clean, immersive view free from the distracting distortion and stretched stars common in simpler designs, especially in faster telescopes.

10mm High-Power Views for Planetary and Lunar Detail

With a 10mm focal length, this eyepiece provides high magnification for resolving fine details on celestial objects. It is an ideal choice for examining the cloud bands of Jupiter, the rings of Saturn, and the intricate craters and rilles on the Moon's surface. The fully multi-coated optics ensure these bright targets are rendered with high contrast and without false color, allowing you to push the limits of your telescope's resolving power on nights of steady seeing.

Built for Observing: 16mm Eye Relief and Secure Grip

Viewing comfort is critical during long sessions, and the Ultima Edge 10mm delivers with 16mm of eye relief. This distance is sufficient for most observers to see the full field of view with their eyeglasses on, while the fold-down rubber eyeguard helps non-eyeglass wearers position their eye correctly and block stray light. The machined aluminum body is lightweight at only 80 g, and a molded rubber grip ring ensures secure, non-slip handling even with cold hands or gloves.

Parfocal by Design: Less Focusing, More Observing

The Ultima Edge eyepiece line is designed to be parfocal, meaning you can swap between different focal lengths in the series and the image will remain nearly in focus. This saves valuable time at the telescope, eliminating the need for major focus adjustments when changing magnification. You can switch from a low-power Ultima Edge for locating an object to the 10mm for a detailed view with only a minor touch-up to the focus knob, keeping your target centered and your session moving smoothly.

Ultima Edge 10mm vs. a Standard 10mm Plössl

While a standard Plössl is a workhorse eyepiece, the Ultima Edge provides distinct advantages for the critical observer.

• Field Curvature: A standard Plössl will typically show sharp stars only in the central 50-60% of the field, with stars becoming progressively less sharp towards the edge. The Ultima Edge's flat-field design maintains pinpoint stars across the entire 60° view.
• Apparent Field of View: The Ultima Edge's 60° AFOV feels more immersive than the typical 50-52° field of a Plössl, providing a wider, more contextual window on your target.
• Eye Relief: With 16mm of eye relief, the Ultima Edge is significantly more comfortable for eyeglass wearers than most 10mm Plössls, which often have eye relief of 8mm or less.