Orion 5595 1.25-Inch V-Block Anti-Fringe Eyepiece Filter V-Block filter effectively removes the distracting color halos from around bright objects Image sharpness, color, contrast, and resolution are greatly improved when using a V-Block filter 1.25" eyepiece filter helps to improve view quality when observing bright celestial objects Features metal filter cell construction and includes protective hard plastic case Recommended for use with refractor telescopes