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1.25" CLS Light Pollution Reduction Filter for Observations of Deep-Sky Objects- the Orion, Lagoon, Swan and Other Extended Nebulae The 1.25" CLS filter is unbeatable for revealing nebulosity. For get superb views of the Orion, Lagoon, Swan and other extended nebulae. The strictest quality control standards are employed throughout the production process. The way an CLS filter works is very simple. It filters out the brightening of the sky due to artificial light. As many celestial objects, such as nebulae, radiate at other wavelengths, a considerable increase in contrast can be achieved by this. The background sky appears darker and, all at once, faint details become visible. Due to its ability to produce exceptionally sharp and clear images, this filter is considered one of the most popular astronomy accessories. It can be used not only for celestial observations but also for astrophotography. This filter can be ofen used in the astrophotography in the city The CLS filter can be used with all 1.25" eyepieces. Package Include: 1 X 1.25Inch CLS Filter 1 X Sturdy Plastic Case