The BAADER Fringe-Killer Filter 1.25" minimizes unwanted blue fringing, comparable to a Minus-
Violet-Filter, while retaining a very pleasing color balance. This would be a contradiction
in itself – only made possible by applying modern DWDM plasma assisted coating technology,
allowing almost a hundred coating layers to be accumulated onto a planoptically polished
substrate – without destroying the optical figure!
This fineoptical tool will help a small
refractor to really put the advertized magnification within reach. Performance rivals that of the
most expensive color correcting lens systems, costing 20 times as much!
Achromat owners rejoice! Baader Planetarium has taken minus violet filtration to a new level. The Fringe Killer brings a type of filtration, never before seen, to the amateur. Rather than simply trimming the shorter wavelengths at a chosen wavelength and slope like all other minus violet filters, the Fringe Killer carefully attenuates a specific region of the spectrum. This allowed Baader to tune the filter for maximum practical reduction of the most damaging defocused blue wavelengths, with only a faint yellow color shift - without dimming and lowering image contrast by resorting to reduction of the important green-yellow wavelengths to crudely restore an apparent color balance! (where the eye is very sensitive, and where refractors are their sharpest) The result is a filter that removes the majority of color fringe, without affecting image brightness all, imparting strong coloration, or reducing contrast at important wavelengths. As any telescope owner knows, light is a valuable commodity for both planetary and deep sky viewing, and the fringe killer preserves every bit of light possible. Terrestrial observers will also find the qualities of this filter to be ideal for their needs.
The high quality of Baader Planetarium filters permits stacking with no image degradation. For an even less colored view, with noticeably boosted color contrasts, we highly recommend stacking a Moon & Skyglow filter with the Fringe Killer. These two filters compliment each other, and the result is an almost totally neutral view (no coloration). Image brightness is also very minimally affected, due to the optimized formula of the Moon & Skyglow, along with the superb anti reflection coatings.
SPECIFICATIONS
WEIGHT 0.059kg
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 2 mm
AR-COATING Phantom Coating® Group, planeoptically polished
FILTER SIZE 1 25 inch
FILTER USAGE Color Correction, IR-Cut
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Bandpass
