CaK Filter

The photographic filter provides high contrast solar images in the calcium light around 393.3 nm.

• The filter is for photography only, not for visual observation of the sun.
• Housed in a 1.25" low profile filter cell
• Transmittance at 393.3nm - FWHM is 3nm
• Ideal for use with photographic objective solar filters, Herschel prisms or other solar prisms

The photographic filter is designed for solar photography in calcium light.

• Telescope side connection is 1.25" and 2".
• Camera side mount is 2" with ring clamp
• Transmission at 393.3nm - FWHM is 3nm
• Maximises contrast of sunspots, granulation and faculae on the solar surface
• Ideal for use with a Herschel prism
• The filter is not intended for visual viewing