The high optical quality of the Baader narrowband filters guarantees no loss in sharpness or contrast. Each substrate is fine-optically polished plane parallel to deliver a smooth and accurate 1/4 wavefront over the entire surface. This special custom polishing operation sets Baader filters apart from the standard commercially precision polished filter substrates used by most other filter manufacturers.
Baader Planetarium Narrowband S-II CCD Filter 8nm Features
- Delivers highest contrast deep sky images
- Ideal for H-Alpha, H-Beta, Oxygen III and Sulfur-II regions
- Rejects light pollution and blocks longer wavelengths
- Guarantees no loss in sharpness or contrast