Astronomik CLS Filter

The Ultimate Light Pollution Filter for Deep-Sky Observation & Astrophotography in India

The Astronomik CLS (City Light Suppression) Filter is one of the most effective light-pollution filters available today, designed to deliver exceptional clarity when observing or imaging deep-sky objects from urban and suburban skies. Whether you're capturing galaxies, nebulae, or star clusters, the Astronomik CLS filter dramatically enhances contrast by filtering out unwanted artificial light while preserving the natural colours of celestial objects.

✨ Key Features

✔ Superior Light Pollution Reduction

The Astronomik CLS filter blocks major light pollution sources such as mercury vapor lamps, high-pressure sodium lights, and skyglow, making it ideal for observers living in bright Indian cities like Mumbai, Delhi, Bengaluru, Chennai, Kolkata, and Pune.

✔ High Transmission for Maximum Detail

With extremely high transmission in the H-alpha (656nm), H-beta (486nm), OIII (501nm), and SII (672nm) regions, the filter maintains excellent brightness and color integrity, perfect for both visual astronomy and DSLR/CMOS astrophotography.

✔ German Precision Filters

Astronomik filters are made in Germany using ultra-thin, scratch-resistant coatings and optically polished glass that ensures:

• Zero image distortion

• No reflections or halos

• Long service life with no fading

✔ Works With All Telescope Types

Compatible with:

• Refractors

• Newtonians / Dobsonians

• SCTs / Maksutov telescopes

• DSLR lenses (using adapter rings)

✔ Perfect for Urban Indian Observers

Indian skies have high levels of light pollution and humidity. The CLS filter is engineered to deliver high-contrast views even in challenging environments, and is widely preferred by astrophotographers for Milky Way, nebulae, and galaxy imaging.

🎯 Recommended For

• Deep-sky observers wanting cleaner, darker backgrounds

• Astrophotographers using DSLR, Mirrorless, CMOS, or CCD cameras

• Users imaging from Bortle 6–9 zones

• Nebula, galaxy, and Milky Way imaging

Why Buy from Modern Telescopes?

Modern Telescopes is India’s largest telescope store and an authorized distributor of Astronomik, Celestron, Bresser, GSO, ZWO, Explore Scientific, Planewave, and many more global astronomy brands.
You receive:

• 100% genuine Astronomik products

• India warranty & after-sales support

• Fast delivery across India

• Expert guidance from India’s top telescope specialists