Baader Filters C2 Swan-Band 15nm 2" (79895)

Introducing the Baader C2 SWAN-Band-Filter, meticulously designed to isolate the two C2 lines at 511 and 514nm.

Named after their discoverer, these two emission lines, known as Swan bands, prominently feature in a comet's gas tail spectrum in the visible range. By permitting only the light from these carbon bands to pass through, the filter effectively blocks stray light, akin to a nebula filter in deep-sky observation. As a result, the structures within the gas tail become more distinct, even under favorable observing conditions.

Simultaneously, it effectively obstructs the OIII line at 501nm and below, a feature absent in other Swan-Band filters. This enhances contrast further, facilitating clearer differentiation between comets dominated by gas tails and those characterized by dust tails, where a SWAN filter offers minimal contrast enhancement.

For enthusiasts in comet observation, a SWAN filter is indispensable equipment.

SPECIFICATIONS

Capacity:

Central wavelength (nm): 513

Half-value width (nm): 15

Filter thickness (mm): 2

Frame:

2"

Mount material:

Aluminium

Coating of optical system:

Multiple

Connection (to the telescope):

2"

General:

Series: C2 Swan-Band

Type: Filters

Type of build: Planetary & Comet Filters

Area of application:

Useful for photographs: Yes

Visually useful: Yes

Twin stars: No

Moon & Planets: No

Nebulae & galaxies: No

Comets: Yes