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Baader Full-Frame CCD Narrowband-Filterset I (H-alpha 7 / OIII / SII)

$399.00
SKU FNSET3-1 (Baader #2459461)
Filter size

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Description
  • Set of 3 Filters: H-alpha 7nm, O III 8.5nm und S II 8nm
  • Non-aging sealed coating edges

CCD imagers will find Baader's Premium Narrowband CCD passfilters to deliver the absolute highest contrast deep sky images in H-Alpha, H-Beta, Oxygen III, and Sulfur-II, with the shortest exposures possible. Their ultra-narrow bandwidths have extremely high transmissions, while completely rejecting light pollution as well as the important blocking of longer wavelengths.

The high optical quality of the Baader narrowband filters guarantees no loss in sharpness or contrast. Each substrate is fine-optically polished plane parallel to deliver a smooth and accurate 1/4 wavefront over the entire surface. This special custom polishing operation sets Baader filters apart from the standard commercially precision polished filter substrates used by most other filter manufacturers. 

In addition to their transmission properties, the Baader coatings were developed with another key goal in mind - eliminate the annoying reflections present in other narrowband astro-filters. To achieve this freedom from reflections, along with excellent out of band blocking, required careful design and testing of the coating stacks.

Coatings are professionally applied in Germany by the most sophisticated equipment available today, ensuring high consistency for bandpass centering, transmission, and out of band blocking. The anti-reflection coatings are designed to prevent halos and balanced to prevent physical deformation of the optically flat substrates. The ultra-hard ionbeam deposition ensures the coatings will never degrade from use or normal cleaning. Each filter is coated individually, permanently sealing the coating edges, in order to guarantee lifetime coating durability and uniformity. Baader mil-spec coatings won't degrade, peel or flake off, unlike the coatings of filters that have been simply cut out of pre-coated sheets of glass. This cutting operation leaves the coating edges rough and torn which enables penetration of moisture between the coatings and substrate.

These filters are available in three sizes, standard 1¼", 2", and a 50.4mm diameter bare substrate (unmounted) for use in SBIG STL and similar cameras. A new unmounted 50mm square version of the H-a filter is now available for large format cameras (H-b, O-III, and S-II 50mm Square filters are due in late summer of 2009). Clear parfocal filters are also available to assist in focusing.

Why Baader Planetarium Filters?

Transmission Curves
H-Alpha Transmission Curve
H-Alpha Transmission Curve
O-III Transmission Curve
O-III Transmission Curve
S-II Transmission Curve
S-II Transmission Curve
Comparison of Transmission curves and spectrums, taken using Baader Dados Spectrograph
Comparison of Transmission Curves and spectrums, taken using Baader Dados Spectrograph

 

Specifications

1.25"

MANUFACTURER Baader Planetarium
SKU (#) 2459461
EAN CODE 4047825101549
WEIGHT (KG) 0.182
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 2 mm
HBW (HALFBANDWIDTH) 7nm
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 1 25 inch
FILTER USAGE CCD, H-alpha, O-III, S-II
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE round

2"

MANUFACTURER Baader Planetarium
SKU (#) 2459462
EAN CODE 4047825101556
WEIGHT (KG) 0.197
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 2 mm
HBW (HALFBANDWIDTH) 7nm
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 2 inch
FILTER USAGE CCD, H-alpha, O-III, S-II
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE round

36mm

MANUFACTURER Baader Planetarium
SKU (#) 2459466
EAN CODE 4047825101594
WEIGHT (KG) 0.078
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 2 mm
HBW (HALFBANDWIDTH) 7nm
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 36 mm
FILTER USAGE CCD, H-alpha, O-III, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE round

50.4mm

MANUFACTURER Baader Planetarium
SKU (#) 2459463
EAN CODE 4047825101563
WEIGHT (KG) 0.213
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 3 mm
HBW (HALFBANDWIDTH) 7nm
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 50.4 mm
FILTER USAGE CCD, H-alpha, O-III, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE round

50x50mm

MANUFACTURER Baader Planetarium
SKU (#) 2459464
EAN CODE 4047825101570
WEIGHT (KG) 0.222
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 3 mm
HBW (HALFBANDWIDTH) 7nm
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 50 x 50 mm
FILTER USAGE CCD, H-alpha, O-III, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE square

65x65mm

MANUFACTURER Baader Planetarium
SKU (#) 2459465
EAN CODE 4047825101587
WEIGHT (KG) 0.264
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 3 mm
HBW (HALFBANDWIDTH) 7nm
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 65 x 65 mm
FILTER USAGE CCD, H-alpha, O-III, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE square

 

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