The SVBONY SV135 7–21mm Zoom Eyepiece (1.25″) is a versatile zoom eyepiece designed for visual astronomical observation. Covering a wide focal range in a single eyepiece, it allows you to change magnification smoothly without swapping eyepieces — ideal for lunar, planetary, and brighter deep-sky targets.
Key Features
- 7–21mm zoom range for flexible magnification without eyepiece changes
- 57°–40° apparent field of view across the zoom range
- Fully multi-coated optics for improved brightness and contrast
- Smooth zoom mechanism for quick, precise adjustment
- Standard 1.25″ barrel compatible with most telescopes
- Durable aluminium housing for reliable long-term use
Flexible Magnification in a Single Eyepiece
The SV135 allows continuous adjustment from 21mm (low power) down to 7mm (higher power), making it easy to fine-tune magnification for different objects. This is especially useful when observing the Moon, Jupiter, Saturn, and bright nebulae, where optimal magnification can change with seeing conditions.
Wide Viewing Experience
With an apparent field of view ranging from 57° at 21mm to 40° at 7mm, the SV135 provides a comfortable viewing experience while keeping targets well framed. This makes tracking objects easier, particularly on non-motorised mounts.
Fully Multi-Coated Optics & Contrast Control
All optical surfaces are fully multi-coated to reduce internal reflections and maximise light transmission. Blackened lens edges help suppress stray light, improving contrast and image clarity, especially when observing bright targets such as the Moon.
Comfortable Eye Relief & Handling
The eyepiece offers comfortable eye positioning across the zoom range, making it suitable for extended observing sessions. Its textured zoom ring and solid aluminium body provide confident handling even when observing in cold or dark conditions.
Ideal for Beginners & Portable Setups
By replacing multiple fixed-focal-length eyepieces, the SV135 is an excellent choice for beginners, travel kits, or grab-and-go telescope setups. It pairs well with refractors, Maksutovs, Schmidt-Cassegrains, and Dobsonians using a 1.25″ focuser.
Package Contents
Everything required to start observing is included.
