The Lumicon 1.25inch Hydrogen-Beta Filter LF3055 is a high-quality filter designed to enhance the performance of telescopes. With a size of 1.25 inches, this filter is compatible with various brands and models, making it versatile for different setups. The filter features a narrowband H-beta design, providing improved visibility and clarity for observing hydrogen-beta emission lines in celestial objects. Perfect for astronomers looking to enhance their viewing experience and capture stunning images of the night sky.