Baader 2" C2 Swan-Band Filter (15nm) – O-III Parallel
Stock count is accurate & shown in real time.
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
Contiguous US / Lower 48:
Free shipping applies to orders over $50 using our chosen carrier/method. Faster paid options are available at checkout.
Alaska, Hawaii & US Territories:
Free shipping applies to many—but not all—products. Enter your ZIP code in cart or upon checkout to confirm options and costs.
International:
International orders do not qualify for free shipping. Shipping, duties, brokerage, tariffs, and taxes are the customer’s responsibility. Some items may be restricted due to export, size, or manufacturer limitations.
- 2" Comet filter for the two brightest C2 emission lines at 511 and 514nm (called "Swan-Band") in the gas tail and gasplume of comets, respectively, FWHM 15nm with 2" (M48) filter thread
- Blocks the adjacent OIII line, which does not predominantly occur in the tail of comets
- CMOS optimized for increased contrast
- Front-Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)
- Blackened edges all around
The SwanBand filter is indeed a very special filter with central wavelength at 512 nm and ≤15nm half-width - for the first time without any O III transmission. It is therefore suitable for a variety of unusual applications some of which require further investigation, whether as an "O III parallel filter" to better remove stars from the image, or as a solar filter in a previously inaccessible section of the spectrum.
C2 Swan-Band Filter (15nm ) – O-III parallel
Contrast gain for comet hunters
The Baader C2 SWAN-Band-Filter with ≤ 15 nm Half-Band-Width 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.
The Baader O-III Super-G filter has got all the advantages of the new generation of CMOS-optimized Baader filters:
- Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
- Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
- Identical filter thickness to existing standards, with utmost care for parfocality
- Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter, making additional front-masks obselete
- Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed)
- Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
Specifications:
- MANUFACTURER: Baader Planetarium
- SKU (#): 4047825054135
- EAN CODE: 4047825054135
- NET WEIGHT (KG): 0.012
- TRANSMISSION RANGE: ≤ 505 – 520 nm
- FILTER THICKNESS (WITHOUT CELL): 2 mm
- HBW (HALFBANDWIDTH): ≤ 15nm
- CWL (CENTRAL WAVELENGTH): 513 nm (for the C2 lines at 511 and 514nm)
- AR-COATING: dielectrically coated, planeoptically polished
- FILTER SIZE: 2 inch
- FILTER USAGE: Gas evolution of comets, O-III-paralel Imaging, Contrast Enhancement
- FILTER MOUNTED: Mounted (LPFC 6mm)
- TYPE OF FILTER: Bandpass
- SINGLE OR SET?: Single Filter
- FILTER SHAPE: round
Other Information
- Country of Manufacture: Germany
C2 Swan-Band Filter (15nm ) – O-III parallel
Contrast gain for comet hunters
The Baader C2 SWAN-Band-Filter with ≤ 15 nm Half-Band-Width 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.
The Baader O-III Super-G filter has got all the advantages of the new generation of CMOS-optimized Baader filters:
- Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
- Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
- Identical filter thickness to existing standards, with utmost care for parfocality
- Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter, making additional front-masks obselete
- Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed)
- Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
Specifications:
- MANUFACTURER: Baader Planetarium
- SKU (#): 4047825054135
- EAN CODE: 4047825054135
- NET WEIGHT (KG): 0.012
- TRANSMISSION RANGE: ≤ 505 – 520 nm
- FILTER THICKNESS (WITHOUT CELL): 2 mm
- HBW (HALFBANDWIDTH): ≤ 15nm
- CWL (CENTRAL WAVELENGTH): 513 nm (for the C2 lines at 511 and 514nm)
- AR-COATING: dielectrically coated, planeoptically polished
- FILTER SIZE: 2 inch
- FILTER USAGE: Gas evolution of comets, O-III-paralel Imaging, Contrast Enhancement
- FILTER MOUNTED: Mounted (LPFC 6mm)
- TYPE OF FILTER: Bandpass
- SINGLE OR SET?: Single Filter
- FILTER SHAPE: round
- 2" Comet filter for the two brightest C2 emission lines at 511 and 514nm (called "Swan-Band") in the gas tail and gasplume of comets, respectively, FWHM 15nm with 2" (M48) filter thread
- Blocks the adjacent OIII line, which does not predominantly occur in the tail of comets
- CMOS optimized for increased contrast
- Front-Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)
- Blackened edges all around
The SwanBand filter is indeed a very special filter with central wavelength at 512 nm and ≤15nm half-width - for the first time without any O III transmission. It is therefore suitable for a variety of unusual applications some of which require further investigation, whether as an "O III parallel filter" to better remove stars from the image, or as a solar filter in a previously inaccessible section of the spectrum.
C2 Swan-Band Filter (15nm ) – O-III parallel
Contrast gain for comet hunters
The Baader C2 SWAN-Band-Filter with ≤ 15 nm Half-Band-Width 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.
The Baader O-III Super-G filter has got all the advantages of the new generation of CMOS-optimized Baader filters:
- Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
- Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
- Identical filter thickness to existing standards, with utmost care for parfocality
- Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter, making additional front-masks obselete
- Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed)
- Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
Specifications:
- MANUFACTURER: Baader Planetarium
- SKU (#): 4047825054135
- EAN CODE: 4047825054135
- NET WEIGHT (KG): 0.012
- TRANSMISSION RANGE: ≤ 505 – 520 nm
- FILTER THICKNESS (WITHOUT CELL): 2 mm
- HBW (HALFBANDWIDTH): ≤ 15nm
- CWL (CENTRAL WAVELENGTH): 513 nm (for the C2 lines at 511 and 514nm)
- AR-COATING: dielectrically coated, planeoptically polished
- FILTER SIZE: 2 inch
- FILTER USAGE: Gas evolution of comets, O-III-paralel Imaging, Contrast Enhancement
- FILTER MOUNTED: Mounted (LPFC 6mm)
- TYPE OF FILTER: Bandpass
- SINGLE OR SET?: Single Filter
- FILTER SHAPE: round
Other Information
- Country of Manufacture: Germany
Baader 2" C2 Swan-Band Filter (15nm) – O-III Parallel