Astronomik CLS 1.25" (M28.5)
Key specifications
| Filter type | Light Pollution |
|---|---|
| Passband | 450-540nm + above 650nm |
| Filter size | 1.25" |
| Mounted | Yes |
About
A light-pollution filter that blocks the emission lines of sodium and mercury street lighting and natural airglow while passing most of the visible spectrum, so stars are barely dimmed. It has no IR-blocking layer — the CLS CCD is the version that does. 1.25" M28.5 mount.