Baader

Baader LRGBC CCD Filterset 31.7mm 2458473

Code: 2458473

Baader LRGBC CCD Filterset 31.7mm 2458473

A new line of Baader LRGBC filters now supplements the Baader narrowband emission line filters (H-beta/O III/H-alpha/S II)

With this addition, Baader offers the complete line of LRGBC (plus the emission line filters H-alpha / S II /O III and H-beta, all sold separately) in unmatched quality grade, all being parfocal and made of precision optically polished glass .

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Baader LRGBC-filters are available in the following sizes:

- 1 1/4"(w.cell mount)
- 2"(w.cell mount)
- 50.8 mm Diam.(unmounted)
- 50x50 mm Square (ummounted)
- 36 mm Diam.(unmounted)
- 65x65 mm Square (ummounted)

Mounted filters feature a glass thickness of 2mm, unmounted filters feature a thickness of 3 mm. (Only Ø 36mm unmounted features a glass thickness of 2mm too)


This high quality five (5) set of filters from Baader are for astroimaging purposes.

Mechanical Properties

  • Parfocal and plane polished substrates. Each individual filter is optically fine-polished to 1/4 wave.
  • Baader LRGBC filters are hard coated individually.
  • Baader filters especially are not cut out of large size plate-glass, which is a typical manufacturing process for economy filters (cut-out filters exhibit micro-cracks around all edges. Capillary action between glass and coating layers will lead to premature ageing due to moisture deposition).
  • All Baader filters have individual coating sealed edges, impermeable against ageing because the the penetration of moisture impossible.
  • Baader filters are being tested repeatedly to comply with MIL-specifications. One common process is to boil the test specimen for one hour in salt water. Baader filters remained completely intact as opposed to filters drilled out of large glass plates.
  • All Baader filters sport scratch resistant hard coatings which can be cleaned repeatedly throughout their entire lifetime as many times as needed - preferably with Baader Optical Wonder cleaning fluid.

Optical Properties

  • No reflections when compared to competing RGB-filter recipes.
  • Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems - an important benefit when imaging in automated mode.
  • Maximised colour contrast for each of the three RGB channels - achieved through steep slopes at all transmission curves combined with science approved placement of spectral window.
  • O III emission line double-weighted in the B and G channel as well, with maximum peak transmission for unparalleled deep sky S/N yield
  • R-Filter provides maximum transmission of H-alpha and S II emission but at the same time completely blocks all NIR and IR from 680 out to 1200 nm
  • Blocking of Mercury and Sodium vapour lamps at 580 nm in the G and R filters blackens the sky background and maximises colour balance and colour separation
MANUFACTURERBaader Planetarium
TRANSMISSION RANGEmultiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL)2 mm /3 mm
AR-COATINGdielectrically coated, planeoptically polished
FILTER SIZEVarious
FILTER USAGECCD, Contrast Enhancement, Light Pollution Reduction, Luminance, RGB
FILTER MOUNTEDMounted (LPFC 6mm) and Unmounted
TYPE OF FILTERBandpass
SINGLE OR SET?Filter-Set
FILTER SHAPEround and square

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