Vixen SLV 4mm 1.25" Long Eye Relief Eyepiece

The Vixen SLV 4mm 1.25" Long Eye Relief Eyepiece is a premium high-power eyepiece designed for observers who require sharp detail, high contrast, and exceptional viewing comfort at demanding magnifications. Built with high-quality lanthanum glass, this eyepiece delivers bright, crisp images with excellent colour correction, making it ideal for lunar, planetary, and double-star observation.

High-Power Precision with Lanthanum Optics

Featuring a 4mm focal length, the SLV 4mm is well suited for detailed planetary and lunar work when atmospheric conditions allow. The use of lanthanum glass helps suppress chromatic aberration and improves colour fidelity, resulting in clean, high-contrast views of fine surface detail.

Comfortable Long Eye Relief

A generous 20mm eye relief makes the SLV 4mm particularly comfortable for extended observing sessions and ideal for eyeglass wearers. The twist-up eyecup includes multiple click stops, allowing precise adjustment for secure eye placement and consistent viewing comfort.

Optimised Optical Design

The eyepiece employs a 7-element, 4-group optical design, with all elements fully multi-coated to maximise light transmission and reduce internal reflections and glare. This design ensures sharp, high-contrast images with minimal aberration, even at higher magnifications. A 45° apparent field of view is optimised for controlled, detailed observation.

Parfocal and User-Friendly

All eyepieces in the SLV series are parfocal, meaning little to no refocusing is required when switching between focal lengths. This makes observing sessions smoother and more efficient, particularly during outreach or when comparing magnifications.

Durable, Practical Construction

The robust all-metal aluminium barrel provides long-term durability, while the polygonal rubber grip offers secure handling and prevents the eyepiece from rolling on flat surfaces. Compact and well balanced, the SLV 4mm integrates easily into any 1.25-inch eyepiece collection.

Reliable High-Magnification Performance

Combining precision optics, long eye relief, and solid mechanical construction, the Vixen SLV 4mm 1.25" Long Eye Relief Eyepiece is an excellent choice for astronomers seeking reliable, comfortable high-power performance in a compact 1.25-inch format.