Sky Rover Optics HFW 7.7–15.4 mm zoom eyepiece is a wide-angle variable focal length eyepiece designed for both astronomical observation and daytime terrestrial viewing. The optical system uses an advanced design with 10 elements in 6 groups including an aspheric lens, providing high image sharpness and improved field correction. Unlike many traditional zoom eyepieces, the apparent field of view remains consistent across the zoom range, offering a more natural and comfortable observing experience. The eyepiece features stepless zoom adjustment with clearly defined click stops, allowing users to easily select specific focal lengths during observation.

Key features

• variable focal length range from 7.7 to 15.4 mm
• wide-angle zoom eyepiece maintaining consistent apparent field of view across the zoom range
• optical design with 10 elements in 6 groups including an aspheric lens
• FMC multi-layer coatings improving light transmission
• stepless zoom adjustment with click-stop positions
• large eye lens with approximately 27 mm diameter
• foldable and detachable eyecup
• barrel compatible with both 1.25" and 2" standards

Included in the set

• Sky Rover Optics HFW 7.7–15.4 mm zoom eyepiece

Technical parameters

• model: Sky Rover HFW 7.7–15.4 mm Zoom Eyepiece
• SKU: 23180
• focal length range: 7.7–15.4 mm
• optical design: 10 elements in 6 groups (including an aspheric lens)
• optical coatings: FMC (Fully Multi-Coated)
• eye relief: 18–20 mm
• eye lens diameter: approx. 27 mm
• barrel size: 2" / 1.25"
• filter thread: 1.25" (M28.5 × 0.6)
• eyecup: folding, detachable
• dimensions: approx. 140 × 50 mm
• weight: approx. 520 g