Baader Fringe Killer 1.25" Filter

The Baader Fringe Killer 1.25" Filter is a precision-engineered minus violet filter designed to dramatically reduce chromatic aberration in achromatic refractor telescopes. By selectively suppressing unfocused blue and violet wavelengths, this filter improves image sharpness while preserving natural colour balance and brightness.

Improved Colour Correction Without Heavy Tint

Unlike conventional minus violet filters that introduce a strong yellow cast or significant light loss, the Baader Fringe Killer maintains excellent transmission in the green–yellow spectral range, where the human eye is most sensitive and refractor optics perform at their best. The result is cleaner planetary detail, sharper lunar edges, and noticeably reduced colour fringing without compromising contrast.

Ideal for Planetary, Lunar, and Terrestrial Viewing

This filter is particularly effective for planetary and lunar observation, where chromatic aberration is most noticeable, but it is equally useful for daytime terrestrial viewing. Its balanced spectral design delivers more natural colour rendition and improved clarity, making it suitable for both night-time and daytime applications.

Optimised for Imaging Applications

For astrophotography, the Baader Fringe Killer offers high optical transmission combined with effective fringe suppression, making it ideal for DSLR and planetary camera setups. Integrated UV/IR cut coatings ensure precise wavelength control outside the visible spectrum, helping maintain tight star profiles and improved focus consistency.

Advanced Baader Coating Technology

The filter features Baader’s advanced DWDM plasma-assisted coating technology, with nearly 50 ultra-thin coating layers per surface. This sophisticated coating structure delivers exceptional durability, high contrast, and long-term optical stability, placing it among the most refined astronomy filters available.

For enhanced performance, the Baader Fringe Killer can be combined with the Baader Moon & Skyglow Filter to improve background contrast, or paired with the Baader Contrast Booster to further increase sharpness and planetary detail. These combinations allow observers to tailor performance to their telescope and observing conditions.

An essential upgrade for achromatic refractor owners, the Baader Fringe Killer 1.25" Filter delivers clearer, sharper, and more colour-accurate views across a wide range of visual observing and imaging applications.