TS Optics Super Reversed Kellner 3.6mm 45° 1.25″ Eyepiece
When you observe planets or double stars at the limit of your telescope's resolving power, every detail matters. This eyepiece is regarded by experienced observers as a reliable tool for maximum magnification - the image stays sharp and contrastful even where other eyepieces with a comparable focal length begin to fall short. Compared to a standard Plössl of similar focal length, this eyepiece is noticeably more comfortable to use, and beginners can orientate themselves in the field of view without difficulty.
Despite its strong performance, the optical design is deliberately simple - just three elements. This keeps contrast and image clarity at a level that rivals optically more complex designs. The RK series is based on the classic Kellner construction, but delivers higher sharpness across the entire field of view.
Recommended for planetary observation
The manufacturer Teleskop-Service recommends the RK3.6 to amateur astronomers who want a straightforward but capable eyepiece for maximum magnification. It is also well suited for centring and aligning a telescope. This planetary eyepiece is particularly appreciated by those who will not compromise on contrast but do not need a wide-angle design. The eyepiece is compatible with all standard telescopes fitted with a 1.25″ or 2″ focuser.
Comfortable viewing for all users
The eyepiece comes with a rubber eye cup that effectively blocks stray light from the sides and improves comfort during longer observing sessions. Spectacle wearers can simply fold down the eye cup, so observing with glasses presents no difficulty at all. Thanks to the comfortable eye relief, RK eyepieces are an excellent choice for beginners who are still developing their technique at the eyepiece.
Key features
- Focal length: 3.6mm
- Apparent field of view: 45°
- Barrel diameter: 1.25″
- Optical design: Super Reversed Kellner (3 elements)
- Sharpness across the entire field of view
- High contrast and image clarity
- Rubber eye cup included - foldable for spectacle wearers
- Compatible with all standard 1.25″ and 2″ focusers
- Suitable for planetary observation and maximum magnification
Technical specifications
| Parameter |
Value |
| Focal length |
3.6mm |
| Apparent field of view |
45° |
| Barrel diameter |
1.25″ |
| Number of optical elements |
3 |
| Optical design |
Super Reversed Kellner (RK) |
| Eye cup |
Rubber, foldable |
| Suitable for spectacle wearers |
Yes |
| Focuser compatibility |
1.25″ / 2″ |
