The CLS 2" nebula filter from Explore Scientific is specially designed to enhance observation of deep-sky objects by eliminating bothersome artificial light, such as that from street lamps and other public lighting sources. This filter blocks the typical wavelengths of mercury and high-pressure lamps, allowing the emissions from celestial objects to pass and be observed with greater clarity and contrast. Ideal for observing galaxies and nebulae otherwise invisible under light-polluted skies, such as galaxy M101, this filter is an indispensable tool for amateur astronomers.

Features:

• Diameter: 2’’
• Eliminates artificial light from public lighting (mercury and high-pressure lamps)
• Optimized for observing faint deep-sky objects

Benefits:

• Significantly improves contrast and sharpness under polluted skies
• Allows observation of deep-sky objects invisible without a filter
• Perfect for amateur astronomers looking to explore faint galaxies, nebulae, and other low-luminosity objects

Compatibility:

• Compatible with all 2’’ eyepiece holders

The Explore Scientific CLS filter is essential for all amateur astronomers who wish to optimize their observations under illuminated skies.