Omegon Moon filter 1.25″
If you have ever observed a full moon through a telescope, you know exactly what we mean - the brightness of the Moon can be literally blinding. The Omegon Moon filter is a simple yet highly effective accessory that lets you observe the Moon comfortably and without unpleasant glare, at any phase of its cycle. The filter is designed for the standard 1.25″ eyepiece barrel diameter, making it compatible with the vast majority of telescopes available on the market.
Optical quality glass construction
The filter is made from glass with optically flat surfaces - a key detail for any technically minded observer. Flat surfaces ensure that the filter introduces no unwanted aberrations or image distortion into the optical path. Light passes through the filter without scattering, and the resulting image remains sharp and contrasty. The filter works on the principle of neutral light reduction, placing it in the category of ND filters (neutral density) designed for astronomical use. It reduces the total amount of light reaching the eyepiece, bringing the intensity of the lunar surface brightness down to a comfortable and safe level.
When and why to use a moon filter
A lunar telescope filter is most valuable during the full moon and when the Moon is high above the horizon and its brightness is at its peak. Without a filter, observing can not only be uncomfortable, but it also impairs your ability to resolve fine details on the lunar surface - craters, mountain ranges and the dark maria. By reducing brightness, the filter simultaneously increases the visible contrast of surface features, so you can truly enjoy the Moon in full detail. The filter is also useful when observing Venus, whose disk can also appear very bright through a telescope.
Quick and tool-free installation
The filter threads directly into the barrel of any standard 1.25″ eyepiece. Installation takes just a few seconds - no tools or adapters are required. The compact metal filter cell provides a firm and secure hold, so the filter will not come loose even when tilting the telescope. The Omegon Moon filter 1.25″ is an excellent choice for beginners who are just starting out with a telescope, as well as for experienced astronomers looking for a reliable and affordable addition to their kit.
Filter specifications
| Parameter |
Value |
| Filter type |
Neutral density (ND), lunar |
| Barrel diameter |
1.25″ |
| Optical element |
Glass with flat parallel surfaces |
| Mounting |
Standard eyepiece thread |
| Cell material |
Metal |
| Recommended use |
Moon, Venus |
About Omegon filters
Omegon filters are popular among astronomers for their solid optical quality at a reasonable price. The Omegon brand has long focused on affordable yet functionally reliable astronomical equipment - from telescopes and mounts to a wide range of accessories. The Moon filter is a good example of this approach: a straightforward product that does exactly what it is supposed to do, without any unnecessary compromises in build quality. Whether you are putting together your first filter set or looking to replace a worn piece, the Omegon Moon 1.25″ is a logical and proven choice.
