Sky-Watcher secondary mirror for 130/650 telescopes
Looking for a replacement for a damaged secondary mirror, or simply want to refresh the optics of your Newtonian telescope? This Sky-Watcher secondary mirror for telescopes with a 130 mm primary mirror is exactly what you need. It is a precision-ground and surface-coated optic designed for the classic Newtonian configuration, which will restore or preserve the full performance of your instrument.
Compatibility
The mirror is primarily designed for the 130/650 telescope, but can also be used without issue in the 130/900 model. It is worth noting, however, that for the 130/900 configuration the smaller variant SW-5515 may be a slightly better fit, as it more closely matches the optimal obstruction ratio for the longer focal length. If you are replacing the mirror in a 130/900 telescope and minimising central obstruction matters to you, consider this detail when making your choice. For the 130/650, this size is the ideal option.
Dimensions and shape
The physical dimensions of the mirror are 52 mm x 37 mm - it has an elliptical shape, which is typical for secondary mirrors in Newtonian telescopes. The ellipse ensures that when viewed at a 45° angle (the standard tilt of a secondary mirror), the illuminated surface forms a correct circle matching the light cone of the primary mirror. The dimensions were verified and documented photographically during May 2024.
Why the secondary mirror matters
The secondary mirror has a fundamental impact on the overall image quality of the entire telescope. Even the largest and most perfect primary mirror will not reach its full potential if the secondary is of poor quality, damaged, or incorrectly aligned. Sky-Watcher is a well-established name in the field and its optical components meet the standards that users of these telescopes have come to expect. Replacing with an original part ensures that collimation and overall optical performance remain at the level you expect from your instrument.
Installation and collimation
Installing a secondary mirror requires basic experience with collimating a Newtonian telescope. After replacement, it is always necessary to carry out careful realignment of the entire optical system so that the primary and secondary mirrors work together correctly. We recommend using a collimation eyepiece or a laser collimator to achieve accurate results.
Technical specifications
| Parameter |
Value |
| Mirror type |
Secondary mirror (elliptical) |
| Dimensions |
52 mm x 37 mm |
| Compatible telescope |
Sky-Watcher 130/650 (also 130/900) |
| Recommended use |
Newtonian reflector telescope |
| Brand |
Sky-Watcher |
Who is this mirror for?
- Anyone replacing a scratched, damaged, or degraded secondary mirror
- Owners of Sky-Watcher 130/650 telescopes seeking an original replacement part
- Users who want to restore full optical performance of their Newtonian reflector
- Observers who carry out their own maintenance and collimation of their telescope
