Vixen SLV 6mm eyepiece 50° 1.25″
The Vixen SLV series has earned a well-deserved reputation among amateur astronomers as one of the finest choices for planetary observation. The SLV 6mm represents the high-magnification end of the lineup - an eyepiece built around precision 7-element lanthanum optics combined with modern fully multi-coated surfaces, delivering image quality that simply has to be seen to be appreciated.
Lanthanum optics - why it matters
Lanthanum glass belongs to a class of optical materials characterized by a high refractive index and low dispersion. In practical terms, this allows the eyepiece to strongly suppress chromatic aberration while preserving natural color rendition across the entire field of view. At just 6mm focal length - where optical demands are at their maximum - this matters enormously. The seven optical elements are arranged to deliver a sharp, high-contrast image free from distracting artifacts, whether you are observing planets, double stars, or globular clusters.
Fully multi-coated lanthanum optics on all air-to-glass surfaces ensure maximum light transmission. Images appear vivid and natural - no washed-out details or flat, lifeless views. The lunar surface, Jupiter's atmospheric bands, and Saturn's rings stand out with remarkable depth and three-dimensionality. Among experienced observers, the SLV series has become synonymous with clean, high-contrast planetary views.
Comfortable eye relief for extended sessions
One of the most practically important features of the Vixen SLV 6mm is its 20mm eye relief - a genuinely exceptional figure for a short-focal-length eyepiece. Many competing models in this category offer only 10-12mm of eye relief, which can become uncomfortable during extended sessions or for observers who wear glasses. With 20mm of relief, your eye sits comfortably away from the eye lens, the exit pupil is easy to locate, and observing remains relaxed even after hours at the telescope. A roll-down rubber eyecup allows quick adjustment for use with or without glasses.
50° apparent field of view
The 50° apparent field of view is a well-proven choice for a planetary eyepiece. It is wide enough to avoid a tunnel-vision effect yet not so wide that edge-of-field quality becomes a concern. With Vixen's lanthanum optics, the image remains sharp and contrasty all the way to the edge of the field - a quality that is immediately apparent once you look through it.
Standard 1.25″ barrel with filter thread
The SLV 6mm is fitted with a standard 1.25″ barrel including a precision-cut M28.5×0.6 filter thread. This makes it straightforward to combine with planetary color filters, a Moon filter, or narrowband emission filters. The thread is machined accurately and filters attach smoothly without any wobble. The eyepiece fits any standard 1.25″ focuser - refractor, reflector, or catadioptric - and slots in immediately without modification.
What can you observe and what magnification to expect
Planetary observation is the primary domain of this eyepiece, but observers focused on the Moon, double stars, and tight star clusters will also appreciate its qualities. With telescopes of 700mm focal length or more, the SLV 6mm delivers comfortable high magnification with sufficient resolution for fine detail. Some example magnification values:
| Telescope focal length |
Magnification with SLV 6mm |
| 700 mm |
~117× |
| 1000 mm |
~167× |
| 1200 mm |
~200× |
| 1500 mm |
~250× |
| 2000 mm |
~333× |
At magnifications around 167× to 200×, the SLV 6mm demonstrates all of its strengths - the lanthanum optics maintain contrast and sharpness where lesser eyepieces begin to lose definition.
Who is it for
The Vixen SLV 6mm is an excellent choice for both newcomers who want to invest wisely from the start - without the need for an early upgrade - and for experienced amateur astronomers who know exactly what quality means and are not prepared to compromise. The SLV series enjoys strong global recognition among amateur astronomers, and the 6mm model remains one of the most popular members of the entire lineup.
Technical specifications
| Parameter |
Value |
| Focal length |
6 mm |
| Apparent field of view |
50° |
| Eye relief |
20 mm |
| Barrel diameter |
1.25″ (31.7 mm) |
| Filter thread |
M28.5×0.6 |
| Optical design |
7-element lanthanum |
| Coatings |
Fully multi-coated (FMC) |
| Eyecup |
Roll-down rubber |
| Brand |
Vixen |
Summary
If you are comparing several eyepieces in a similar price range, the Vixen SLV 6mm makes a compelling case through sheer optical performance. Sharpness, contrast and observing comfort are qualities you will notice every time you step outside under a clear sky. The combination of lanthanum optics, generous eye relief and a reliable filter thread makes this one of the most complete short-focal-length eyepieces available today.
