Lunt Solar B3400 Calcium K Filter for Refractors

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This Calcium K module will transform your normal astronomical telescope into a Ca-K solar telescope. Simply put the Ca-K module into the 2" focuser of your telescope, and you are ready for solar observing in the light of the Calcium-K wavelength. The module is fitted with the necessary energy rejection filter so nothing else is needed.

Internal narrowband filters allow for a <2.4 Angstrom bandwidth at 393nm. The Ca-K wavelength is at the edge of the visible light spectrum for human eyes, so for many people visual observing is difficult.  Therefore the Ca-K Module is optimized primarily for imaging which will yield the best results. A Calcium-K module like this will allow capture of high contrast surface detail and also prominences.

This module is optimised for telescopes up to 100mm aperture and 3060mm focal length.

The Ca-K module is in a straight extension tube, for 2" focuser on the telescope side and with 2" and 1.25" clamp on the camera side.

Results with the filter can be further enhanced by adding the Baader K-Line filter which will have the effect of increasing contrast still further.