Baader Filters C2 Swan-Band 15nm 2″
Original price was: $171.00.$98.99Current price is: $98.99.
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Product description
The Baader C2 SWAN-Band-Filter isolates the two C2 lines at 511 and 514nm.
These two emission lines, named Swan bands after their discoverer, dominate the spectrum of a comet’s gas tail in the visible range. The filter allows only the light from the two carbon bands to pass through and, among other things, blocks the ubiquitous stray light, similar to a nebula filter in deep-sky observation. Structures in the gas tail thus become clearer even under good observing conditions.
At the same time, it completely blocks the OIII line at 501nm and below, which other Swan-Band filters allow to pass. This allows for even higher contrast, and comets with gas tails can be distinguished even better from those dominated by a dust tail (and where a SWAN filter provides only a small contrast enhancement).
For ambitious comet observers, a SWAN filter is part of the basic equipment.
| Central wavelength(nm) | 513 |
|---|---|
| Half-value width(nm) | 15 |
| filter thickness(mm) | 2 |
| Frame | 2" 2" A standard measurement for accessories, expressed as 2 inches. 2" is equal to 50.8 millimetres.Click to read more… |
| Mount material | Aluminium |
| Coating of optical system | multiple |
| Connection (to the telescope) | 2"2" A standard measurement for accessories, expressed as 2 inches. 2" is equal to 50.8 millimetres.Click to read more… |
| Series | C2 Swan-Band |
| Type | Filters Filters No matter whether they are for observing or for astrophotography, filters are very important accessories.Click to read more… |
| Type of build | Planetary & Comet Filters Planetary & comet filters Colour and pass filters for assisting planetary observation and photography.Click to read more… |
| Useful for photographs | yes |
| Visually useful | yes |
| Twin stars | no |
| Moon & Planets | no |
| Nebulae & galaxies | no |
| Comets | yes |
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