How about Svbony 1.25/2'' Zoom Eyepiece?
How about Svbony 1.25/2'' Zoom Eyepiece?
With SVBONY's expanding lineup of zoom eyepieces, many customers ask: "Which one is best for me?" Today, we'll break down the key differences between our 1.25" (SV135, SV171, SV191, SV215) and 2" (SV230, SV245) models to help you decide.
Key Factors to Consider When Choosing a Zoom Eyepiece
Customers typically evaluate zoom eyepieces based on:
✅ Optical design – Lens composition & coatings for clarity
✅ Weight & ergonomics – Comfort during long sessions
✅ Eye relief – Especially important for eyeglass wearers
✅ Zoom range & smoothness – Flexibility vs. stiffness in adjustment
✅ Click-stop function – For precise focal length locking
✅ Parfocal performance – Minimal refocusing when zooming
✅ Light leakage – Stray light control for contrast
Below, we compare SVBONY’s zoom eyepieces to match your needs.
| Brand | SVBONY | SVBONY | SVBONY | SVBONY | SVBONY |
| Model | SV230 | SV245 | SV215 | SV191 | SV135 |
| Focal Length | 8mm-20mm | 8mm-16mm/0.31-0.63" | 3-8mm | 7.2-21.6mm | 7-21mm |
| Apparent Field of View | 57°- 72° | 63°- 63° | 56° | 42°-65° | 52°~36° |
| Barrel Size | 1.25" & 2" | 1.25" & 2" | 1.25" | 1.25" | 1.25" |
| Coatings | Fully multi-coated | Fully multi-coated | Fully Multi-Coated | Fully Multi-Coated | Fully Multi-Coated |
| Blackened Lens Edges | Yes | Yes | Yes | Yes | Yes |
| Eye Relief | 17-19mm | 18-17mm/0.71-0.67" | 10mm | 18-20mm | 13mm - 14mm |
| Parfocal | Yes | Yes | Yes | Yes | No |
| Rubber Eye Guard | Yes | Yes | Yes | Yes | Yes |
| Clickstop Click Design | Yes | Yes | Yes | No | No |
| Aspheric Eyepiece | Yes | No | Yes | No | No |
| Flatfield Design | Yes | No | No | No | No |
| Dioptrix Mounting | Support | Support | No | No | No |
| Material of Barrel | Stainless steel | Stainless steel-1.25" & Aluminum Alloy-2" | Stainless steel | Metal | Metal |
| Filter Threads | M28.5x0.6 & M48x0.75 | M28.5x0.6 & M48x0.75 | M28.5x0.6 | M28.5*0.6 | M28.5*0.6 |
| Groups/Elements | 6/9 | 5/8 | 4/6 | 4/7 | 3/5 |
| Outer Diameter | 60mm | 60mm/2.36" | |||
| Height | 132mm | 486g/17.17oz | |||
| Net Weight | 500g/17.66oz | 129*60mm/5.08*2.36" | 167g / 5.87oz / 0.367lb | 95g |
Best For Scenarios
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SV135 → Beginners wanting budget-friendly performance
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SV171 → Balanced upgrade for sharpness & comfort
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SV191 → Enthusiasts seeking premium coatings & eye relief
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SV215 → High-magnification lunar/planetary views
🔭 2" Zoom Eyepieces (Wide-Field & Deep Sky)
Best For DSO Objects
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SV230 → Deep-sky observers needing smooth, lockable zoom
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SV245 → Premium wide-field views with ED glass for reduced CA
Why Choose SVBONY Zoom Eyepieces?
✔ Smooth, precise zoom mechanics – No stiff or jerky adjustments
✔ Multi-coated optics – Maximize light transmission
✔ Click-stop (SV215/SV230/SV245) – Lock focal lengths instantly
✔ Light-sealed design – Minimizes glare and ghosting
Upgrade your viewing experience today!
Thanks for your reading.
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Can you use an adapter to covert the SV135 zoom lens 7-21 from 11/4" to 2" and get better viewing?