Omegon red filter #25 2″
Color filters are among the simplest yet surprisingly effective tools for visual planetary observation. The Omegon #25 red filter is a classic representative of this category - it transmits the red portion of the spectrum while suppressing blue and green components of light, significantly increasing contrast on planetary surfaces. If you regularly observe Mars, Jupiter or Saturn and want to get the most out of your telescope, this filter is well worth your attention.
How the red filter #25 works
The red filter #25 for visual planetary observation works on a simple principle: by suppressing the blue component of light, it strongly enhances dark regions and belts on Jupiter, surface features on Mars, and atmospheric structures on other planets.
- On Mars - helps distinguish surface formations from polar caps and atmospheric veils
- On Jupiter - enables better observation of dark belts and turbulence in the cloud layers
- On Saturn - improves visibility of atmospheric banding and surface contrast
The filter is designed exclusively for visual use and is not intended for astrophotography, where the strong reduction of light would be a disadvantage rather than a benefit.
Build quality and compatibility
The filter is mounted in a quality aluminium threaded cell in 2″ format, which screws easily and securely into a standard telescope eyepiece holder or directly into eyepieces with a thread. Aluminium ensures low weight while maintaining sufficient rigidity, so the filter holds firmly in the thread and does not come loose during observation.
The Omegon Basic series is aimed at astronomers who are looking for solid performance at a reasonable price without unnecessary compromises in build quality.
Recommended use
The filter is suitable for telescopes with a 2″ eyepiece holder - that is, medium to larger instruments where color filtration also makes sense in terms of light throughput. Best results are achieved when used on a refractor or reflector with a focal ratio suitable for planetary observation (typically f/8 or more). Smaller apertures may suffer from insufficient light when using this filter, so it is advisable to match the filter choice to your specific instrument.
Why choose a color filter
Color filters of the #25 series are particularly popular among visual observers who want a simple and affordable way to improve contrast when observing solar system planets. They require no power supply and no special setup - just screw the filter in, put your eye to the eyepiece, and observe the difference.
About the Omegon brand
Omegon is a brand with a long tradition in astronomical optics and accessories. Basic series products are designed to offer reliable performance even for beginning astronomers, while the build quality and materials used meet standards that will also be appreciated by more experienced observers. The Omegon filter for planetary observation is an example of how entering the world of color filters does not have to be expensive, yet delivers tangible results from the very first use. The wide range of Omegon filters, eyepieces and other accessories covers the needs of both visual and photographic astronomers at all levels of experience.
Technical specifications
| Parameter |
Value |
| Filter type |
Color filter - red |
| Filter number |
#25 |
| Format |
2″ |
| Cell material |
Aluminium |
| Mounting |
Standard 2″ threaded cell |
| Intended use |
Visual planetary observation |
| Recommended objects |
Mars, Jupiter, Saturn |
| Series |
Omegon Basic |
