Lunt 7.2–21.5 mm Flat-Field Zoom Eyepiece

• One eyepiece, many magnifications: 7.2–21.5 mm zoom range lets you dial in the perfect power for solar (with proper filtration) and nighttime targets without swapping eyepieces

• Flat-field optical design keeps stars and solar detail crisp from center to edge for comfortable, context-rich viewing

• Ultra-low 0.1% anti-reflective coatings for high contrast and minimal ghosting—the same coating technology used on Lunt etalons

• Optimized for both solar and general astronomy, making it a versatile upgrade for outreach, travel kits, and grab-and-go rigs

• 1.25" barrel interfaces cleanly with standard diagonals, focusers, and accessories

• Comfortable sessions with 15 mm eye relief and a well-controlled apparent field across the zoom range

• Precision build and glare-managed internals deliver bright, high-contrast views of prominences, lunar details, planets, and wide star fields

Specifications

• Focal Length Range: 7.2–21.5 mm

• Barrel Size: 1.25"

• Optical Layout: 7 lenses / 4 groups (flat-field design)

• Eye Relief: 15 mm

• Apparent Field of View: ~53° at 7.2 mm to ~40° at 21.5 mm

• Diameter: 47 mm

• Height: 82 mm

• Coatings: 0.1% anti-reflective (same process as Lunt etalons)

• Use Case: Solar observing (with proper filtration) and night-sky viewing

What’s in the Box?

• Lunt 7.2–21.5 mm Flat-Field Zoom Eyepiece