Baader colour filters are carefully manufactured for amateur astronomical use. The glass is finely polished to be plane-parallel. These filters far exceed the quality of the usual "roughly polished" (= hot-blazed) colour glass filters.
Thanks to their fine optical polish, these filters can be used at any point in the beam path – well in front of the focal point – (e.g. in front of a binocular attachment!) without causing optical errors (astigmatism) or otherwise impairing the image in any way!
Further special features of Baader filters:
- Elaborate frame with the largest possible free opening to prevent vignetting
- CNC-milled "crown grip" – offers excellent handling comfort
- 7-layer anti-reflection coating on both sides with only 0.25% residual reflection per surface
Orange long-pass filter 570 nm: Increases contrast when observing the moon and planets at dusk
- Improves the visibility of dark areas on Mars and penetrates the haze layer of the Martian atmosphere
- Shows more detail in the cloud bands of Jupiter and Saturn
- Ideal for daytime observation of the moon, Mercury and Venus
