2 inch H-beta 5.5nm Filter
#2961083

The Baader H-Beta 5.5nm filter is specifically designed for visual observation of faint emission nebulae under bright skies. Unlike H-alpha filters, which are extremely difficult to use visually due to the lack of sensitivity of our eyes at the deep red end of the spectrum, H-beta emissions are very close to where our eyes are most sensitive. Because of quantum-mechanical coupling with H-Alpha, you can see many of the same structures through an H-Beta filter. This makes it act like a visual H-Alpha filter.


Specifications

SKU (#) :	2961083
WEIGHT (KG):	0.07
SUITABLE FOR F/RATIO	f/15 to f/1.8
TRANSMISSION RANGE:	H-beta
FILTER THICKNESS (WITHOUT CELL):	2 mm
HBW (HALFBANDWIDTH):	5.5nm
CWL (CENTRAL WAVELENGTH):	486,1 nm
AR-COATING:	Reflex-Blocker™ hard coated, planeoptically polished
FILTER SIZE:	2 inch
FILTER USAGE:	CMOS, CCD, H-Beta
FILTER MOUNTED:	Mounted (LPFC 6mm)
TYPE OF FILTER:	Narrowband
SINGLE OR SET?:	Single Filter
FILTER SHAPE:	round

$479

2 year Manufacturer's warranty

In Stock