Tele Vue Ethos 21mm 2 inch Eyepiece

The Tele Vue Ethos 21mm 2" eyepiece delivers an immersive 100° apparent field of view, setting the standard for wide-field eyepieces. Designed for deep-sky and wide-field observation, it offers exceptional edge-to-edge sharpness and contrast.

Advantages

With its 100° AFOV, the Ethos 21mm provides a spacewalk experience, making celestial objects appear to float in space. The 8-element optical design with fully multi-coated lenses and blackened edges ensures high contrast and minimal stray light. The fold-down rubber eyecup and rubberized grip enhance comfort and handling.

Suitable for

• Deep-sky observation of nebulae, galaxies, and star clusters
• Wide-field views of the Milky Way and large celestial objects
• Use with refractor, reflector, and catadioptric telescopes

Key specifications

• Focal Length: 21 mm
• Apparent Field of View: 100°
• Barrel Size: 2 inches (50.8 mm)
• Eye Relief: 15 mm
• Number of Lens Elements: 8
• Lens Coatings: Fully Multi-Coated (FMC)
• Field Stop Diameter: 36.2 mm
• Filter Threads: 2-inch
• Eyecup: Fold-down rubber
• Housing Material: Anodized Aluminum
• Country of Origin: USA

Recommendations

For the ultimate wide-field experience, pair the Ethos 21mm with a premium telescope and a 2-inch diagonal. Its parfocal design allows easy switching with other Ethos eyepieces without refocusing.