Baader Filters C2 Swan-Band 15nm 2″

The Baader Filters C2 Swan-Band 15nm 2″ is a high-quality narrowband filter specifically designed to capture the C2 Swan emission (around 514 nm) that is characteristic of carbon-rich comets and certain nebular structures. This emission band gives comets their typical greenish glow, and is visible only with highly selective optical filters.

With a bandwidth of only 15 nanometers, this filter blocks virtually all unwanted light pollution and provides extremely high contrast between the object and the sky background. This makes the C2 Swan-Band an essential tool for comet photography, spectroscopy and scientific applications where detail and accuracy are crucial.

The 2″ version is ideal for use with larger sensors or wide-beam optical systems. Thanks to Baader's exclusive hard coating the filter is resistant to moisture, scratches and oxidation. The stable optical coating prevents center wavelength shift even in fast optics (up to f/2).

Application:
The Baader C2 Swan-Band 15nm 2″ is ideal for:

• Astrophotography of comets with clear C2 emission.
• Deep-sky objects with faint Swan lines.
• Use with fast optics (up to f/2) and large image sensors.

Perfect for mounting in 2″ filter wheels, adapters or off-axis systems. This filter offers the highest image quality for those who want to precisely capture the subtle green of C2 emission.

Specifications:
Filter type: Narrowband filter (C2 Swan-Band)
Central wavelength: 514 nm
Bandwidth (FWHM): 15 nm
Transmission:>90%
Barrel size: 2″
Optically flat glass with hard coating
Parfocal: Yes
Housing: Aluminum, black anodized
Suitable for fast optics: up to f/2
Application: comet and deep-sky photography
Light pollution suppression: High
Country of origin: Germany