Daystar CALCIUM QUARK Filter Solar Imaging Inside/back of filter is black

Inside/back of filter is black to reduce unwanted internal reflections

Contains TWO separate

Daystar's Imaging Focal Reducer can give you more field of view in your images

Does not support auto-focus or electronic aperture control

Daystar CALCIUM QUARK Filter Solar Imaging Inside/back of filter is blackDaystar Quark Calcium H Model Filter is the first Calcium Eyepiece for F 7 or longer focal ratio refractors. This new, All In One design marries high quality components of adapters, snouts, and Daystar Calcium H filter into one simple assembly. Through design efficiency and optimization, now users can enjoy the known high quality optics of Daystar at an affordable price. Why Calcium H line? Many astronomers forget that the Calcium H line and K line