Astro Gaze: Vixen SLV and NPL Series Eyepieces Review
Explored and Evaluated: Vixen SLV & NPL Series Eyepieces - Suggested Picks for Stargazing
Scores:- SLV Series: 4.4/5 Stars- NPL Series: 4.1/5 Stars
Vixen SLV Series Eyepieces
Perks:
- Exceptionally sharp 50-degree field
- Comfortable long eye relief
- Easy-to-adjust eyecup
- Premium materials for clarity
Downsides:
- Narrow 50-degree field can feel cramped
- Steep pricing might deter some buyers
- A wide-angle eyepiece could deliver the same sharpness
These eyepieces, now sold by Explore Scientific, closely resemble the ES52 line but employ lanthanum glass for enhanced contrast and reduced scatter. They come in various focal lengths: 25mm, 10mm, 15mm, 12mm, 10mm, 9mm, 6mm, 5mm, 4mm, and 2.5mm, all of 1.25" size. The SLV series' clear views and comfortable 20mm eye relief, combined with the twist-up eyecup, make for a pleasurable observing experience, albeit at a price. Whether the limited field of view or the premium tag is worth it comes down to the user.
Vixen NPL Series Eyepieces
Rating: 4.1/5 Star
Perks:
- Sharp 50-degree field
- Comfortable eyecup
- Affordable pricing
Downsides:
- Narrow 50-degree field can be confining
- Eye relief is problematic for shorter focal lengths
- Similar price tag to high-quality wide-angle eyepieces
The NPL eyepieces are designed in the Plossl tradition, available in sizes 40mm, 30mm, 25mm, 20mm, 15mm, 10mm, 8mm, 6mm, and 4mm with 1.25" barrels. Given their Plossl roots, they produce sharp images, yet short eye relief at shorter focal lengths can cause discomfort. The 25mm and 30mm are the most recommended for smart low-power use, but one might consider an SLV if performance is of utmost importance. While affordability is offered, alternatives like the Agena Starguiders provide similar performance and comfort at a competitive price range.
Comparing the series:
In this comparison, we take a look at the construction, optical performance, and value these eyepieces offer both new astro enthusiasts and seasoned stargazers.
| Feature | Vixen SLV Series | Vixen NPL Series ||-------------------|-------------------------|--------------------------|| Field of View | ~50° | ~50° || Eye Relief | ~20mm (all focal lengths)| ~20mm or longer (varies by focal length—some are less at shorter FLs) || Glass | Multi-coated lanthanum glass | Multi-coated, true Plössl design || Barrel Size | 1.25" | 1.25" || Build Quality | Premium materials, metal housing | Plastic construction (some prefer metal) || Manufacturing | Made in China | Made in Japan (prior versions, checks not always clear) || Pricing | Mid to high (depends on market conditions) | Budget to mid-range (often lower than SLV) || Availability | Current production | Available, but market presence may differ |
Performance
- SLV Series
- Optical Quality: Impressive clarity and contrast with minimal internal reflections.
- Eye Relief: Consistent long eye relief for comfortable viewing experience.
- Edge Performance: Good, though demands a wider field compared to ultra-wide options.
- NPL Series
- Optical Quality: Consistent Plössl performance—sharp center, softer edges for shorter focal lengths.
- Eye Relief: Varies by focal length, with shorter lengths less comfortable for eyeglass wearers.
- Edge Performance: Aligns with other Plossls, featuring field curvature and soft edges at fast focal ratios.
Value for Money
- SLV Series
- Pros: Enhanced comfort, impressive clarity, and robust build for a value-driven upgrade from basic Plössl eyepieces.
- Cons: Higher pricing compared to NPLs and some competitors offering wider fields[2].
- Best For: Comfort-focused users seeking an upgrade from Plössl eyepieces and do not opt for ultrawide fields.
- NPL Series
- Pros: Affordable, reliable Plössl performance for beginners and budget-conscious observers.
- Cons: Limited comfort at short focal lengths and not as wide of a field when compared to some alternatives at similar pricing.
- Best For: Budget-focused beginners who prefer classic Plössl performance.
The smooth blend of technology and astronomy is evident in the Vixen SLV and NPL Series eyepieces, both offering sharp views and diverse gadgets for distinct field-of-view preferences. While the SLV Series boasts premium materials, lanthanum glass, and a comfortable eye relief, it faces competition from affordable smart-home devices like the Agena Starguider, delivering similar performance and comfort at a competitive price range. On the other hand, the NPL Series provides a more budget-friendly alternative, maintaining the traditional Plossl design for reliable performance despite some limitations in eye-relief and field-of-view compared to modern smart-home devices and gadgets.
