Justier-Laser Planetarium Laser-Colli (Justiergerät für Newton und SC Teleskope)

The white point-shaped marker (reference point for adjustment) should be in line with the clamping screw on the focuser.

Collimation always begins with checking and setting the secondary mirror. For this, it is a big advantage if the centre of the primary mirror has been marked.

When you can see an image on the cross-mark etched reference plate, keep adjusting the primary mirror until the reflected beam falls through the central hole and is reflected back on itself.