Eyepiece Celestron Omni 15 mm for Telescope — 15 mm Focal Length, 1.3 cm Aperture, Black/Silver

The Celestron Omni 15 mm eyepiece is a compact optical accessory designed for visual observation with 1.25" focuser telescopes. With a 15 mm focal length and a 50° apparent field of view, this eyepiece provides a balanced view suitable for lunar and planetary observing as well as general deep-sky targets. The optical design uses a premium four-element configuration with multiple high-transmission coatings and blackened lens edges to improve contrast and deliver clear, sharp images. The body is machined from aluminum and finished with a two-step anodizing process in black and silver tones for a matte, low-reflection surface. The eyepiece includes a foldable rubber eyecup and a threaded 1.25" insert barrel that accepts standard filters.

Advantages

The four-element optical design with multi-coated surfaces increases light transmission and reduces internal reflections, producing crisp images with improved contrast. Blackened edges on the optics further enhance contrast for fine planetary and lunar details. The compact aluminum body is lightweight and durable, while the anodized matte finish minimizes glare during use. The rubber eyecup folds for observers who wear glasses, and the threaded barrel provides compatibility with common 1.25" filters. A rubberized grip on the longer-barrel models ensures secure handling during observing sessions.

Suitable for

• Planetary and lunar observation where contrast and detail are important
• General visual observing of star clusters, double stars, and brighter deep-sky objects
• Educational and amateur astronomy sessions where a durable, easy-to-handle eyepiece is required

Key specifications

• Focal length: 15 mm
• Apparent field of view: 50°
• Optical design: four-element, multi-coated lenses with blackened edges
• Barrel diameter: 1.25" (threaded for filters)
• Aperture (lens diameter): 13 mm
• Materials and finish: aluminum body with two-step anodized matte finish in black and silver
• Eyecup: foldable rubber eyecup (suitable for eyeglass wearers)
• Dimensions: 77 × 43 × 40 mm

How to use

Insert the threaded 1.25" barrel into the telescope focuser and secure the eyepiece according to your focuser's locking mechanism. Fold or extend the rubber eyecup as needed to achieve the correct eye relief, especially when wearing glasses. Use the focuser to achieve a sharp image and fine-tune focus while observing. If using filters, screw a compatible 1.25" filter into the threaded barrel before inserting the eyepiece or after it is secured in the focuser, depending on convenience and required filter changes.

Usage recommendations

For best results, allow the eyepiece and telescope to reach ambient temperature before observing to reduce thermal currents. Clean the lenses only with appropriate optical cleaning tools and avoid touching the glass surfaces. Use the eyepiece with telescopes that accept 1.25" eyepieces and match the focal length to your observing target for optimal magnification and field of view.