DeltaOptical Yellow-Green Filter #11 1.25″
Overview
The DeltaOptical Yellow-Green Filter #11 is a specialized astronomical accessory designed for observing planets of the Solar System. This filter effectively reduces blue light and significantly improves the contrast of surface details on planets. Thanks to its standard 1.25″ thread, it is compatible with the vast majority of telescopes and eyepieces available on the market.
Key Benefits
- Reduces blue light, which is a common cause of image blur due to atmospheric turbulence
- Noticeably improves contrast between light and dark regions on planetary surfaces
- Enhances overall image sharpness and clarity
- Easy to install - simply screws into the bottom of any standard 1.25″ eyepiece
- Made from high-quality optical glass with precise color coating for long-lasting stable optical performance
Planetary Applications
Mars
The Yellow-Green #11 filter is particularly effective for observing Mars. It darkens the dark surface regions of the Red Planet, increasing contrast and making it easier to distinguish light and dark areas. With this filter, observers can more clearly identify polar ice caps, dark terrain features, and dust storms.
Saturn
When observing Saturn, the #11 filter helps to improve visibility of the famous Cassini Division within the planet's ring system. It also reveals finer structural details within the rings and enhances contrast across the planet's disk.
Jupiter
For Jupiter observation, the filter improves visibility of atmospheric belts and makes it easier to track the Great Red Spot. It helps reduce the blurring effect caused by atmospheric turbulence, resulting in a sharper and more detailed image.
Specifications
| Parameter |
Value |
| Filter designation |
#11 |
| Color |
Yellow-Green |
| Thread diameter |
1.25″ |
| Material |
Optical glass with color coating |
| Compatibility |
Standard 1.25″ eyepieces and telescope nosepieces |
| Primary use |
Planetary observation (Mars, Saturn, Jupiter) |
Installation and Usage Tips
Installation is straightforward - the filter screws directly into the bottom of a 1.25″ eyepiece barrel or into the telescope's nosepiece before attaching the eyepiece. For best results, it is recommended to use this color filter under good observing conditions, when the target planet is sufficiently bright and well above the horizon. Optimal results are achieved when observing planets near opposition - the point at which they are closest to Earth and at their brightest.
Care and Maintenance
After use, carefully clean the filter with a soft cloth and store it in a protective case to preserve the optical coating and extend the filter's lifespan.
About DeltaOptical
DeltaOptical is a reputable brand in the field of astronomical equipment, specializing in the production of quality telescopes and accessories for astronomers of all experience levels. The brand was founded with the goal of providing high-quality astronomical gear at accessible prices. DeltaOptical products are designed by astronomers for astronomers, with an emphasis on practicality, reliability, and excellent optical performance. Every DeltaOptical product undergoes strict quality control, ensuring long-term durability and dependable performance across all observing activities.
