Eyepiece Tele Vue Nagler Type V 16mm 1.25" for telescopes

The Tele Vue Nagler Type V 16mm 1.25" eyepiece delivers a 16 mm focal length in a 1.25-inch barrel designed for visual astronomy. Part of the Nagler Type V series, this eyepiece is engineered to provide a wide apparent field of view and comfortable eye relief, enabling detailed observation of planets, star clusters, nebulae and other deep-sky objects when paired with compatible telescopes. Its optical design emphasizes edge-to-edge sharpness and minimal internal reflections to preserve contrast across the field.

Advantages

The Nagler Type V 16mm offers a wide apparent field of view for immersive viewing while maintaining good eye relief for eyeglass wearers. High-quality multi-element optics reduce aberrations and deliver consistent sharpness from center to edge. The 1.25" barrel makes it compatible with a large selection of amateur and advanced telescopes, and the mechanical construction provides reliable alignment and comfortable handling during extended observing sessions.

Suitable for

• Planetary observation at medium magnification
• Wide-field views of star clusters and rich Milky Way fields
• Observation of nebulae and extended deep-sky objects
• Use with refractors, reflectors and catadioptric telescopes accepting 1.25" eyepieces

Key specifications

• Focal length: 16 mm
• Barrel diameter: 1.25 inches
• Apparent field of view: wide (Nagler Type V design)
• Optical design: multi-element eyepiece optimized for edge sharpness and contrast
• Eye relief: comfortable for general observing and eyeglass use

How to use

Insert the eyepiece into the telescope’s 1.25" focuser or diagonal and secure it with the focuser thumbscrew or clamp. Focus the telescope on the target using the focuser, then fine-tune your eye position to find the sweet spot where the entire field is visible and sharp. For best results, allow the telescope to reach thermal equilibrium with the outside air, and use appropriate magnification by selecting this 16 mm eyepiece in combination with the telescope’s focal length.

Usage recommendations

For comfortable and detailed viewing, pair the 16 mm Nagler Type V with telescopes that provide moderate focal ratios. Use a well-collimated instrument and consider using a star diagonal with refractors for improved ergonomic viewing. Clean lenses with a soft blower and microfiber cloth only when necessary to avoid surface damage.