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Eye Relief: 18mm - 16.3mm°
Eye relief seems much more important for glasses wearers, whether you have a poor sight or wear sunglasses on a strongly sunny day. And this eyepiece’s eye relief is 18-16.3mm, comfortable for viewing with or without glasses.
FMC Optics & Edge Blackened
Fully multi-coated optics and that the edge of every glass is blackened ensure high light transmission and reduce stray light for excellent and high-contrast images.
Focal Length: 7mm to 21mm
Zoom eyepiece brings great convenience to visual astronomy that there are no swapping between eyepieces to change magnification and there is no need to break away form your observing to change the focal length. And the 6-Element 4-Group optical design for superior optical performance. PLEASE NOTE: Due to the structure of zoom eyepiece, the internals will produce a slight rattling sound when changing the magnification or shaking.
1.25” Interface & M28.5*0.6 Thread
The eyepiece is threaded for a filter (standard M28*0.6 female thread) and the interface diameter is1.25” for connecting to a telescope for visual celestial astronomy, like moon and high powered terrestrial targets at a broad range of focal lengths.
Field of View: 57-40°
Equipped with a generous 40° to 57° field of view and a non-click stop adjustment mechanism, this eyepiece allows smooth transitioning between focal lengths, ensuring that the observer can find the perfect combination of field of view and magnification that the target object and seeing conditions will allow.
SVBONY SV135 7mm to 21mm 1.25inch Zoom Eyepiece
NO.15/25/58/80A Color Filter Kit
Since planetary surface details and atmospheric phenomena reflect sunlight as contrasting colors, you can use color filters to accentuate subtle details on planets, comets, and the Moon by selectively increasing contrast between features and markings of different hues. Simply put: using various color filters makes planetary details easier to see.
- #15 Deep Yellow Planetary Filter: Boosts contrast of lunar features, accentuates red and orange features on Saturn, Jupiter, and Mars, reveals low-contrast cloud detail on Venus.
- #25 Red Planetary Filter: Enhances Martian surface details in large telescopes, reveals cloud definition on Venus, accentuates bluish cloud regions on Jupiter and Saturn.
- #58 Green Planetary Filter: Enhances contrast of blue and red structures on Jupiter (including Red Spot), melt lines around Martian polar ice caps, accentuates Saturn's cloud belts.
- #80A Medium Blue Planetary Filter: Enhances details in Jupiter's belts and Red Spot, high clouds and polar caps on Mars, lunar surface details, Venus cloud features.
- Pls note:
The filters of SVBONY are not designed for sun observation. Do not look at the sun with SVBONY filter. You would be blind if you fail to observe the warning
- SVBONY 1.25 " NO.15 Color Filter
- SVBONY 1.25 " NO.25 Color Filter
- SVBONY 1.25 " NO.58 Color Filter
- SVBONY 1.25 " NO.80A Color Filter
- 4PCS Sturdy Plastic Case
