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filters

Baader f/2 High Speed Filter - H-Alpha 1.25" LPFC - FHALHS-1

Baader Planetarium   ——   SKU: BAA-FHALHS-1
$344.00 CAD
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Baader f/2 High Speed Filter - H-Alpha 1.25" LPFC

Baader's New f/2 Highspeed Narrowband Filters and Filtersets (1¼" and 2", H-alpha / O-III / S-II) are designed especially for the delicate requirements of extremely fast astrograph optics, such as Hyperstar, RASA, and ultra-fast instruments from TEC/AP/ASA/etc. Conventional narrowband filters cause a heavy loss in transmission due to the strong CWL-shift. In extreme cases the CWL even shifts out of the FWHM ("CWL" stands for "Center-wavelength" / "FWHM" stands for "Full width at half-maximum intensity").

Therefore these filters have a CWL-preshift which matches f/2 to f/3 perfectly. Also the FWHM is optimized. In spite of the typical line broadening with such fast optical trains they are able to deliver maximum contrast. For the first time these filters allow the effective use of extremely fast optics for high contrast imaging of emission nebulae. Using these filters between f/1,8 and f/3,5 shows a dramatic improvement compared to any regular set of narrowband-filters.

Specifications:

MANUFACTURER Baader Planetarium
SKU (#) 2459393
WEIGHT (KG) 0.059
COLOUR H-alpha
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 1¼"
VISUAL OR IMAGING? imaging
FILTER USAGE CCD, f/2 Highspeed, H-alpha
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round
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