screwable Collimation laser with adapter M28pM48n to screw onto any M48 thread

Some people think that the biggest disadvantage of a Newtonian telescope is that it needs regular checking of collimation. This step can be done quickly and easily with some practice.

Laser collimators can be used to check and correct collimation before each observing session. They are great to do collimation alone in the dark, especially if we have longer FL Newton telescope.

BTC laser collimator is the lightest and smallest among the collimators. The laser beam is well defined, the housing fits stable on an 1,25" eyepiece holder. Screen is 45 degree angled so you can see easily the laser beam from the end of the telescope. Runs from a CR2032 battery, and can be collimated if necessary.

GSO laser collimator fits to a 1.25" focuser, the process can be checked from behind the telescope while working with the adjustment screws. The laser beam is parallel to the body of the device, but in case of need the beam itself can be collimated with the three small screws located on the sides. To check the collimator itself slowly turn in the focuser and check how the laser spot moves.

Baader Laser Colli MkIII is a well machined laser collimator with a small, well defined laser beam and great screen. It won best Laser award in "Sky at Night" magazine.