Baader Planetarium Colour Filter Dark Blue
Key specifications
| Filter type | Other |
|---|---|
| Passband | Dark blue (≅ W38A) |
| Mounted | Yes |
About
A fine-optically polished dark blue planetary colour filter (≅ Wratten 38A) with 7-layer Phantom Group AR coating on both sides, mounted in a blackened aluminium cell threaded on both ends; sold in 1¼" and 2".