Calcium Modul with B1800 blocking filter - 1.25'' in extension tube with T2 and 2'' connection
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 100 aperture and 1800mm focal lenght.
Delivered with order:
• Extension tube with T2 and 2" connection, for 1.25'' Focuser
• blocking filter B1800 with IR and UV protection