Focusing is the most important step in astronomical observation, but it is always difficult and time-consuming. Through the principle of light diffraction by Bahtinov Mask, small light spots can be turned into easily identifiable graphics, making focusing simple and fast.

Get ready with all your imaging or visual gears

Point the telescope at a bright star

Put on the Bahtinov Mask and you will find that the light spot is divided into three intersecting lines

Twist the Focuser Knob to move the middle line to the center

Take off the mask and your telescope is well focused