Astronomik CLS Light Pollution Filter

No filter can completely erase light pollution, but the Astronomik CLS is highly effective at suppressing the specific wavelengths emitted by common streetlights. You will notice a significant improvement in contrast, making it much easier to see faint nebulae and galaxies that are usually washed out by urban sky glow.

Because this is a broad-band filter designed to block specific light pollution lines, it will shift the color balance of your view. You may notice a slight greenish or blueish tint, which is normal for this type of filter, but it is easily corrected during post-processing if you are doing astrophotography.

This specific model is designed with an SCT (Schmidt-Cassegrain Telescope) thread for rear-cell mounting. It is intended for use with SCTs or telescopes that share that specific threading, so it will not fit standard 1.25-inch or 2-inch eyepiece holders without an adapter.

Absolutely not. This filter is designed for deep-sky observation and light pollution suppression, not solar viewing. Never use this filter to look at the sun, as it does not provide the necessary protection to prevent permanent eye damage or equipment failure.

The filter is built to high standards with durable glass and comes with a 10-year warranty, reflecting Astronomik's confidence in its longevity. It is designed to withstand regular use in outdoor conditions, provided you handle it with the same care you would use for your telescope lenses.