Baader Planetarium Eyepiece Filter

These filters are designed for standard 1.25-inch eyepieces. As long as your eyepiece has the standard internal thread for filters, they will screw in securely.

Yes, these filters are designed to be stacked. Because they feature high-quality, striae-free substrates and multi-coatings, you can combine them without worrying about ghost images or significant degradation in image quality.

Color filters help increase the contrast of specific planetary features. For example, they can make subtle cloud bands on Jupiter or polar caps on Mars stand out more clearly against the planet's surface, allowing you to see details that might otherwise be washed out.

The main difference is optical precision. While budget filters often introduce wedge errors or reflections, these use 7-layer hard multicoatings and high-grade substrates polished to 30 arcseconds, ensuring you maintain maximum light transmission and image sharpness.

No extra adapters are required. They use a standard threaded design that screws directly into the barrel of any compatible 1.25-inch eyepiece.

The set includes six filters: Red (610 nm), Orange (570 nm), Yellow (495 nm), Green (500 nm), Bright Blue (470 nm), and Dark Blue (435 nm).