Omegon #11 1.25″ colour filter - green
Colour filters are among the simplest yet most effective tools a planetary observer can add to their accessories. The Omegon #11 green colour filter belongs to the Basic series and offers a solid optical foundation for both visual and photographic observation - all in a compact body with a 1.25″ thread that fits the vast majority of eyepieces and cameras on the market.
Construction and optical quality
The filter body is made from aluminium, ensuring low weight and resistance to corrosion. The optical element features multi-coating, which minimises unwanted reflections on the glass surface and allows light to pass through the filter with minimal losses outside the desired spectral band. The 1.25″ thread is a standard size, and the filter simply screws directly into an eyepiece barrel or a camera adapter.
What can you observe with the #11 green filter?
The green colour filter for planetary observation works on the principle of selective transmission - the green component of light passes through while contrasting colours are suppressed. This allows both the eye and a camera sensor to distinguish details that would otherwise merge into the overall brightness of a planet.
The green #11 filter is recommended primarily for observation of Saturn. Green light helps enhance the contrast of clouds and bands in the planet's atmosphere, and under good seeing conditions it contributes to a more clearly defined Cassini division in the rings. The filter is suitable for both visual use and photography, making it useful for visual observers as well as astrophotographers experimenting with planetary RGB image stacking.
Please note that this filter is not intended for light pollution reduction, nor for observation of the Moon, Mars, Jupiter, Venus, Uranus, or for daytime or twilight observation. Its strength lies specifically in Saturn and targeted photographic applications.
Filter parameters
| Parameter |
Value |
| Filter number |
#11 |
| Colour |
Green |
| Thread size |
1.25″ |
| Body material |
Aluminium |
| Optical coating |
Multi-coating |
| Recommended object |
Saturn |
| Visual use |
Yes |
| Photographic use |
Yes |
| Series |
Basic |
Who is this filter for?
The Omegon #11 green filter is an excellent choice for both beginner and experienced observers who want to get more detail from their telescope when viewing Saturn. Thanks to the standard 1.25″ thread, it can be easily combined with a wide range of eyepieces and planetary cameras.
Key benefits at a glance
- Enhances cloud and band contrast in Saturn's atmosphere
- Improves visibility of the Cassini division under good seeing
- Suitable for visual observation and planetary RGB photography
- Multi-coated optics for minimal light loss
- Lightweight aluminium body - durable and corrosion-resistant
- Standard 1.25″ thread compatible with most eyepieces and cameras
About the Omegon brand
Omegon is an established European brand focused on accessible yet well-crafted astronomical optics and accessories. The Basic series filters are designed to deliver measurable benefits without an unnecessarily high price tag - multi-layer coating and an aluminium body are standards you do not always find in more affordable filters. The brand offers a wide range of products from eyepieces and mounts to complete filter sets, making it easy to build a full setup for both visual and photographic astronomy.
