Baader Blue CCD 2" Telescope Filter with LPFCEach individual filter planeoptically polished to 1/4 wave and parfocal.
Each filter coated separately. Filters are NOT just cut or bored out from a large coated plate.
Baader individual hard coatings do ensure sealed coating edges, impermeable from moisture and environmental forces.
Baader-filters feature hard coatings that may be cleaned with Baader Optical Wonder fluid without scratches.
Baader RGB CCD filters are COMPLETELY free from reflections due to an elaborate coating design.
RGB-imaging allows equal weighting factors for each channel, very important for automated imaging.
Unique filter design for absolute maximum contrast with extremely high gradients,to allow clear differentiation of colours.
O III emission overlaps on B/G-filters with maximum transmission to allow efficient and natural colour imaging.
R-filter delivers maximum transmission for H-alpha and S II while cutting IR with highest efficiency
Gap between G/R-filters serves to reduce light pollution from Mercury and Sodium lamps and improves color balance and color separation.