The Explore Scientific CLS 1.25 Filter is a high-quality objective filter specifically designed for astronomy. It serves to reduce unwanted light and enhance the visibility of celestial objects. This filter is particularly useful in urban areas, where light pollution makes it difficult to observe stars and other astronomical phenomena. The CLS filter selectively blocks certain wavelengths of light while allowing the important spectral ranges for observing nebulae and galaxies to pass through. With a diameter of 1.25 inches, this filter is compatible with most telescopes and eyepieces. Its robust construction ensures durability and ease of use. The Explore Scientific CLS 1.25 Filter is a valuable addition for any astronomy enthusiast looking to improve the quality of their observations.