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Baader UBVRI Photometric Johnson/Bessel V-Filter (4mm Glass)

$197.00
SKU FUBVRI-1V (Baader #2459440V)
Filter size

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Description
  • 1.25" or 50x50mm Baader UBVRI - V-Filter
  • Photometric Johnson/Bessel filter system
  • Partial dielectric design with BBAR minimized reflections
  • Planeoptically polished, 4mm glass thickness
  • Non-aging sealed coating edges

Baader UBVRI Filters - Specifications

Baader 4 mm thick UBVRI filters feature a proprietary design that strictly adheres to the classic Johnson/Bessel transmission specification. Unlike the classic construction that regularly has a thickness of 5mm or more, the Baader-filters are made of dielectric layers as well as absorption glasses. This allows for a smaller filter thickness of 4 mm. The original stack of pure colored glass had a thickness of 5 or 6 mm and would be too thick and too heavy for modern filter wheels.

In the old days UBVIR-filters were used for photodetectors and no one would care if the huge stack of cemented absorption glasses would cause havoc in terms of inherent internal reflections. Our method of combining dielectric coatings with a combination of short pass and long pass filters does provide for perfect off-band blocking into the far ends of the spectrum. This steep off-band-blocking would not be possible with pure dielectric layers over such a large transmission range.

Specifications

1.25"

MANUFACTURER Baader Planetarium
SKU (#) 2459440V
EAN CODE 4047825101785
WEIGHT (KG) 0.029
TRANSMISSION RANGE Transmission range after Bessel
FILTER THICKNESS (WITHOUT CELL) 4 mm
CWL (CENTRAL WAVELENGTH) Bessel V
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 1 25 inch
FILTER USAGE Specialty, UBVRI
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Bandpass
SINGLE OR SET? Single Filter
FILTER SHAPE round

50x50mm

MANUFACTURER Baader Planetarium
SKU (#) 2459444V
WEIGHT (KG) 0.029
COLOUR Black
TRANSMISSION RANGE Transmission range after Johnson/Bessel
FILTER THICKNESS (WITHOUT CELL) 4 mm
CWL (CENTRAL WAVELENGTH) Bessel V
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 50 x 50 mm
FILTER USAGE Specialty, UBVRI
FILTER MOUNTED Unmounted
TYPE OF FILTER Bandpass
SINGLE OR SET? Single Filter
FILTER SHAPE square