| Manufacturer | Optolong |
|---|---|
| MPN | Q1CF000404Y |
| Brand | Optolong |
| Type | Filter |
Check the listing for details. Optolong Clear Focusing Imaging Filter for Astrophotography - 2". Condition: New. Listed at 34.98 USD. About Optolong's Clear Focusing Filter. The Optolong Clear Focusing filter is designed to highly pass the visible spectral region from 420-680nm at 98.5% transmission. Use of astrophotography filters, especially narrowband filters, often results in dim images which can be difficult to focus.