Lunt Calcium Ca-K diagonals
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Calcium K line Filter-Diagonal System. Internal narrowband filters allow for a <2.4 Angstrom bandpass. Primarily an imaging system due to the difficulty of many to visually see everything that CaK has to offer. For telescopes up to 100mm aperture and 600mm focal length Delivered with order: â€¢ Diagonal with 2 inch barrel and 1.25 inch eyepiece holder