Collimating a Laser collimator

Ever wonder if that inexpensive laser collimator is really doing what it should? I never really trusted them, therefore I put mine on test one day. The first thing I had to build was V-shaped holder made out of wood, to prevent the collimator from moving around during tests.

V-shaped holder

Next I nailed the holder on to the wooden table to stabilize it and put the turned on collimator in v-shaped notch. 5 meters away (farther is better) where the laser beam was shining on the wall I attached a white paper for markings. Now rotate the laser collimator and see if the beam is making a circle or it stays a dot. If it stays in one place, your collimator is in perfect alignment. As you can see from the markings on the picture, my laser beam was making a circle. Using the two small allen adjustment screws at the back of the collimator move the beam so that it is pointing in the center of the marked circle and rotate it again. Repeat this until the beam remains in place while rotating the collimator. It took me about 5 iterations.
That’s it. You have successfully realigned you laser collimator, now use it with confidence for aligning your telescope optics.

Black markings on paper clearly show that my laser beam was making a circle.

V-shaped holder in action, preventing the collimator to move around.