Baader UBVRI Photometric U-Filter 1¼
Baader UBVRI Photometric U-Filter 1¼
Baader UBVRI Photometric U-Filter 1¼
Baader UBVRI Photometric U-Filter 1¼
Baader UBVRI Photometric U-Filter 1¼

Baader UBVRI Photometric U-Filter 1¼" (4mm glass)

Product code: 2459440U
in stock
[value]
£153.00
£127.50 (ex. VAT)

PREORDER : 2 weeks

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Product information

  • 4 mm glass thickness
  • non-ageing sealed coating edges

Baader UBVRI Filters - Specifications

Baader 4 mm thick UBVRI filters feature a proprietory 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.

MANUFACTURERBaader Planetarium
SKU (#)2459440U
EAN CODE4047825101761
WEIGHT (NETTO)0.029
TRANSMISSION RANGETransmission range after Bessel
FILTER THICKNESS (WITHOUT CELL)4 mm
CWL (CENTRAL WAVELENGTH)Bessel U
AR-COATINGdielectrically coated, planeoptically polished
FILTER SIZE1 25 inch
FILTER USAGESpecialty, UBVRI
FILTER MOUNTEDMounted (LPFC 6mm)
TYPE OF FILTERBandpass
SINGLE OR SET?Single Filter
FILTER SHAPEround

Product Info

PREORDER 2 weeks
GTIN 4047825101761
Brand Baader
Product Code 2459440U
Delivery Weight Package
1kg