Baader Ultra-Narrowband H-alpha 3.5nm Filter (Specify Size)

$297.00
Article number: FHALNU
Availability: Order Now!
Delivery time: More on the Way to us
  • Precision grade enforced H-alpha filter for f/10 to f/3.5 optical systems
  • Opens up the extremely narrow 3,5nm H-alpha world
  • This enforced contrast results in even fainter stars, providing more signal of faintest nebulae detail
  • Manufacturing such ultra-narrow filter does require extreme coating homogeneity and very high CWL precision, which these filters are designed for. CWL= Center-wavelength / FWHM= full width half maximum.

Baader's New Ultra Narrowband Enforced Filters

These three sizes of Ultra-Narrowband filters open up the extremely narrow H-alpha, O-III, and S-II world. This enforced contrast provides more signal of the faintest nebula detail. Manufacturing such ultra-narrow filters requires extreme coating homogeneity and very high Center Wavelenth Precision, which these filters have been designed for. Designed for use on optical systems from f/10 to f/3.5.

Now available in all popular sizes; 1.25"Mounted, 2" Mounted, 31mm Round, 36mm Round, 50.4mm Round, 50x50 Square, and 65x65mm Square.

NOTE: In general, the H-alpha ultra narrowband filter is not suitable for solar observation. The half-bandwidth of 3.5nm equals 35 angstroms, much wider than needed for high quality solar observation (sub-angstrom). Never use this filter for visual observation of the sun.

1.25"

MANUFACTURER Baader Planetarium
SKU (#) 2459451
WEIGHT (KG) 0.066
COLOUR Black
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 2 mm
HBW (HALFBANDWIDTH) 3,5 nm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES enforced Narrowband
FILTER SIZE 1 25 inch
FILTER USAGE CCD, Deep Sky, H-alpha
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

2"

MANUFACTURER Baader Planetarium
SKU (#) 2459454
EAN CODE 4047825032171
WEIGHT (KG) 0.066
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 2 mm
HBW (HALFBANDWIDTH) 3,5 nm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 2 inch
FILTER USAGE CCD, Deep Sky, H-alpha
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

31mm

MANUFACTURER Baader Planetarium
SKU (#) 2459452
WEIGHT (KG) 0.066
COLOUR Black
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 2 mm
HBW (HALFBANDWIDTH) 3,5 nm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES enforced Narrowband
FILTER SIZE 31 mm
FILTER USAGE CCD, Deep Sky, H-alpha
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

36mm

MANUFACTURER Baader Planetarium
SKU (#) 2459453
WEIGHT (KG) 0.066
COLOUR Black
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 2 mm
HBW (HALFBANDWIDTH) 3,5 nm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES enforced Narrowband
FILTER SIZE 36 mm
FILTER USAGE CCD, Deep Sky, H-alpha
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

50.4mm

MANUFACTURER Baader Planetarium
SKU (#) 2459455
EAN CODE 4047825032188
WEIGHT (KG) 0.066
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 3 mm
HBW (HALFBANDWIDTH) 3,5 nm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 50.4 mm
FILTER USAGE CCD, Deep Sky, H-alpha
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

50x50mm

MANUFACTURER Baader Planetarium
SKU (#) 2459456
EAN CODE 4047825032195
WEIGHT (KG) 0.066
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 3 mm
HBW (HALFBANDWIDTH) 3,5 nm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 50 x 50 mm
FILTER USAGE CCD, Deep Sky, H-alpha
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

65x65mm

MANUFACTURER Baader Planetarium
SKU (#) 2459457
WEIGHT (KG) 0.073
COLOUR Black
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 3 mm
HBW (HALFBANDWIDTH) 3,5 nm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES enforced Narrowband
FILTER SIZE 65 x 65 mm
FILTER USAGE CCD, Deep Sky, H-alpha
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE square

 

 

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