Celestron Ultima Edge 65° 24mm - 1.25"

A 65° Flat-Field View From 8 Lens Elements

The core purpose of the Ultima Edge design is to eliminate field curvature, an aberration that causes stars near the edge of the view to appear out of focus. By utilizing an advanced 8-element lens system, this 24mm eyepiece projects a flat focal plane, ensuring that objects across the entire 65° apparent field are equally sharp. This is a critical advantage when observing open star clusters like the Pleiades (M45) or scanning the lunar terminator, where edge-to-edge clarity reveals fine details that would otherwise be lost.

29mm Eye Relief and All-Aluminum Body

With an exceptional 29mm of eye relief, the Ultima Edge 24mm is ideal for observers who wear eyeglasses. This long eye relief allows you to see the entire field of view comfortably without having to press your eye against the lens. The eyepiece body is machined from high-grade aluminum, giving it a durable, premium feel, and features a molded rubber grip for secure handling in the dark. At 12.32 oz, its heft is a direct result of the substantial glass required for its flat-field optical correction.

• Fold-Down Eye Guard: The soft rubber eyeguard can be used up to block stray light or folded down for use with eyeglasses, providing maximum comfort.
• 1.25" Barrel: The mounting barrel is compatible with any 1.25" focuser or star diagonal and is threaded to accept standard 1.25" astronomy filters.
• Fully Multi-Coated Optics: All 8 lens elements are fully multi-coated to maximize light transmission and contrast, ensuring bright, clear images of faint deep-sky objects.

Ultima Edge 24mm vs. Standard Plössl Designs

While a traditional Plössl eyepiece is a versatile workhorse, its simpler 4-element design does not correct for field curvature. In many telescopes, this results in stars becoming progressively less sharp as you look away from the center of the field. The Ultima Edge 24mm directly addresses this limitation.

The trade-off for this superior optical correction is complexity and weight; the 8-element Ultima Edge is heavier and more substantial than a typical 24mm Plössl. However, for the observer who demands consistent sharpness across the entire frame, especially when studying wide star fields or lunar landscapes, the flat-field view is a decisive upgrade.