Celestron Ultima Edge 15mm 1.25" Eyepiece
The Celestron Ultima Edge 15mm eyepiece delivers high-performance, flat-field optics in a compact 1.25" format, offering sharp, distortion-free views across a generous 65° apparent field. Ideal for observers who demand edge-to-edge clarity, this mid-power eyepiece is equally at home on lunar surfaces, planetary detail, and deep-sky targets.
True Flat-Field Performance
Unlike standard eyepieces that show softness or distortion toward the edge, the Ultima Edge 15mm uses an integrated field flattener to maintain sharp focus across the entire field of view. The eight-element, five-group optical layout is engineered to correct field curvature and astigmatism—making it an excellent match for fast telescopes where these issues are most visible. Whether you're using a fast f/5 Newtonian or an apochromatic refractor, expect clean, pinpoint stars from center to edge.
Wide 65° Apparent Field
With a 65° apparent field, the Ultima Edge 15mm strikes a pleasing middle ground between immersive views and manageable eye placement. It offers a noticeably wider perspective than standard Plössls, helping you frame larger targets or better navigate dense star fields while retaining excellent image control. This focal length is perfect for medium magnification—ideal for resolving fine lunar structure, revealing planetary contrast, or exploring bright deep-sky objects like globular clusters and nebulae.
Comfortable Eye Relief and Roll-Up Rubber Eyecup
With a generous 16mm of eye relief, the Ultima Edge 15mm is comfortable to use for long sessions and is accommodating for eyeglass wearers. Instead of a twist-up design, Celestron uses a traditional roll-up rubber eyecup—simple, durable, and effective at blocking stray light while giving observers flexibility in how they position their eye. It’s a no-fuss design that just works.
Threaded for 1.25" Filters
The machined aluminum barrel includes standard 1.25" filter threads, allowing you to easily attach nebula filters, planetary color filters, or light pollution reducers. It's a practical addition that enhances the eyepiece's versatility without adding bulk.
Parfocal Across the Series
The Ultima Edge eyepieces are parfocal within the series, so you’ll experience little to no refocusing when switching between focal lengths. That’s especially handy when you're fine-tuning magnification during critical observing sessions, such as tracking atmospheric detail on Jupiter or dialing in the best view of a faint galaxy.
Premium Build and Coatings
Each lens surface is fully multi-coated to boost light transmission and contrast. Blackened lens edges and internal baffling help suppress stray reflections and preserve image quality. The anodized aluminum body is rugged, lightweight, and designed to perform under repeated use in the field.
A Step Up for Any Telescope
The Celestron Ultima Edge 15mm is a major upgrade from basic stock eyepieces, delivering premium-level sharpness, better off-axis correction, and a more immersive field without pushing into overly wide territory. If you're building a well-rounded eyepiece kit or want a versatile performer for medium magnification views, the Ultima Edge 15mm deserves a place in your case.
