Astronomik CLS Canon EOS M Clip filter
If you photograph the night sky near cities or in areas with significant light pollution, you know how frustrating it can be to fight the orange glow of sodium lamps or the bluish cast of LED lighting. The Astronomik CLS filter for Canon EOS M in Clip format is an elegant and practical solution that allows you to capture fine details of nebulae, star clusters and galaxies where disturbing artificial light would otherwise dominate.
Clip-filter system - one filter for all your lenses
The Clip-Filter system by Astronomik is designed so that the filter simply snaps directly into the camera body in front of the sensor - just remove the lens, slide the filter into the designated position and reattach the lens. This eliminates the need to purchase separate filters for each lens diameter. The filter sits securely in an aluminium frame that is precision-machined for a tight fit inside the Canon EOS M body. Aluminium ensures durability, low weight and minimal thermal expansion, so the filter stays reliably in place even when working in cold night conditions.
CLS - broadband city light suppression
The CLS (City Light Suppression) series from Astronomik belongs to the so-called broadband filters. This means that unlike narrowband filters, it does not pass only narrow emissions of specific spectral lines, but preserves transmission across a wider spectrum of light. It passes the key emission lines of hydrogen alpha (H-alpha), oxygen (OIII) and sulphur (SII), while blocking the typical spectral regions of sodium discharge lamps (589 nm) and mercury vapour lamps. The result is a significant improvement in contrast between the sky background and the photographed deep-sky objects, without dramatically affecting the colour rendering of stars.
The CLS filter is therefore an excellent choice not only for dedicated astrophotographers, but also for those who want to capture the Milky Way or larger nebula complexes with either a modified or unmodified DSLR or mirrorless camera.
Designed for astrophotography
It is important to note that the Astronomik CLS filter is intended exclusively for photographic use - it is not suitable or intended for visual observation through an eyepiece. In astrophotography with exposure times ranging from tens of seconds to several minutes, its benefit becomes very pronounced, particularly in suppressing the light pollution gradient and improving the signal-to-noise ratio in the final image.
Astronomik - German quality without compromise
Astronomik is a German manufacturer with a long tradition of producing premium astronomical filters. Every filter undergoes strict quality control and optical coatings are applied with high precision to ensure reproducible and predictable results from shot to shot. Clip filters are also manufactured to very tight tolerances, so there are no unwanted reflections or vignetting caused by imprecise seating of the filter in the camera body.
For an astrophotographer who wants reliable, well-crafted accessories without compromise, Astronomik is a natural choice - whether you are taking your first shots of the night sky or building an advanced imaging system for deep-sky photography.
Key features at a glance
- Clip-filter format - fits directly into the Canon EOS M camera body, compatible with all lenses
- Broadband CLS filter - suppresses sodium (589 nm), mercury vapour and LED light pollution
- Passes H-alpha, OIII and SII emission lines
- Precision-machined aluminium frame - lightweight, durable, thermally stable
- Tight manufacturing tolerances - no vignetting or unwanted internal reflections
- For photographic use only - not intended for visual observation
- Compatible with both modified and unmodified cameras
- Made in Germany by Astronomik
