The Baader Calcium Gen-II Line Filter is a new generation of advanced calcium astrophotographic filters that capture surface details such as granulations, flares and sunspots on our central star with exceptional resolution and contrast.
To achieve higher contrast, the manufacturer has further narrowed the filter's transmission range, which was developed specifically for CMOS cameras. The Baader Calcium Gen-II line filter only passes radiation at 394 nm in a very narrow 5 nm range, which only CMOS sensors can properly detect.
Baader's own developments are also found in this filter, such as the Reflection-Blocker™ anti-reflection layer that prevents image degradation due to reflections, and even the edges of the filter are painted black to prevent glare in that area. Long life is guaranteed not only by the sealed, machined edges (other filters are often cut from a single sheet), but also by the Life-Coat™ layer that protects against scratches. The thickness of the filter's glass material is the same as Baader's standard filter thickness.
The standard 1.25-inch filter can be used either for eyepiece projection photography (screwed onto the eyepiece of your telescope) or for primary focus photography attached to the nose piece of the camera, in both cases combined with the use of the appropriate protective filter.
Attention! The Baader Calcium Gen-II line filter should only be used in combination with other solar filters! These can be the accessory Baader AstroSolar Photo Film (ND 3.8)(visually not usable alone!) or even a Herschel prism. The function of these is to significantly reduce the heat from the Sun before the light reaches the line filter, thus protecting our instruments and eyes from damage! The Baader Calcium Gen-II line filter isan astrophotographic filter only! During prolonged visual observations, significant levels of UV rays can damage our eyes! In addition, the human eye is quite insensitive at the low wavelength of 394 nm, so visually most details would not even be visible, making visual use pointless.