Dualband (Ha, CaK, and CaH) filter

The photographic filter increases contrast on the solar surface in the calcium and H-alpha ranges.

• Telescope side connection is 1.25" and 2".
• Camera side connection is 2" with ring clamp
• The filter has a wider transmission in the calcium and H-alpha ranges
• Enhances the contrast of sunspots, granulation and details on the edge of the "solar disk
• Ideal for use with a Herschel prism
• Not intended for visual observation