Main use of a CLS CCD filter
The filter completely blocks emission lines of artificial light sources like streetlights (e.g. sodium- and mercury-vapor) as well as generic airglow. All ‘important’ emission lines as well as the spectral range of the night-adapted eye pass through. The supplementary IR-blocking layer allows the use for DSLR and Webcams without an integrated IR-block filter.
- Easier resolution of Double Stars.
- With the EOS-Clip model, photography with DSLR cameras is feasible even under extremely light-polluted conditions without shifting the white balance.
- The 1.25″ and 2″ socket models can be used for observations from light-polluted areas.
CLS (non-CCD): For cameras with an integrated IR-filter or for visual observation.