{"id":30208,"date":"2025-10-06T11:13:25","date_gmt":"2025-10-06T09:13:25","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=30208"},"modified":"2026-10-13T10:55:40","modified_gmt":"2026-10-13T08:55:40","slug":"baader-c2-swan-band-filter-15nm-1-25-inches","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/baader-c2-swan-band-filter-15nm-1-25-inch\/","title":{"rendered":"Baader C2 Swan-Band Filter 15nm 1.25 inches"},"content":{"rendered":"

Baader C2 Swan-Band Filter 15nm 1.25 inch: contrast boost for comet hunters<\/strong><\/h2>\n\n\n\n

Comets with an active gas tail shine primarily in the two C2 carbon lines at 511 and 514 nm, the so-called Swan bands. This filter transmits precisely those two lines and blocks almost all other light, including the nearby OIII line at 501 nm. The result: a comet's gas tail and coma stand out against a dark sky background.<\/p>\n\n\n\n

While other Swan-band filters partially transmit the OIII line, this Baader filter blocks it completely. This allows you to immediately see the difference between a gas tail and a dust tail, and also makes the filter useful as an OIII parallel reference filter.<\/p>\n\n\n\n

\"Baader<\/figure>
\"Baader<\/figure>
\"Baader<\/figure>
\"Baader<\/figure><\/figure>\n\n\n\n

Built on Baader's CMOS filter technology<\/h4>\n\n\n\n

The filter is CMOS-optimized with Reflex-Blocker hard coating against halos, plano-optically polished glass, blackened edges, and Life-Coat edge sealing for a lifetime coating.<\/p>\n\n\n\n

Visual and photographic<\/h4>\n\n\n\n

Visually, the gas tail of a bright comet clearly gains contrast. Photographically, you isolate the C2 emission for images that show the structure of the tail, even under a light-polluted sky.<\/p>\n\n\n\n

Featured accessories<\/h3>\n\n\n\n

For deep-sky nebulae besides comets, the Baader Narrowband OIII and H-alpha filters are the logical addition.<\/p>\n\n\n\n

For whom yes and for whom no<\/h3>\n\n\n\n