This laser collimator is an essential accessory for your Newton telescope and is especially recommended for Newtons with a fast focal ratio (f/4 or f/5). Only a well-collimated telescope can deliver its best performance. The laser collimator makes the correct alignment of a Newton telescope simple, quick, and precise. You can adjust it in no time, even in the dark at your observation site, without any additional accessories. Precisely manufactured, it fits snugly and without tilting in the focuser. The textured projection surface allows for side recognition of the reflection, making it easier to comfortably adjust the primary mirror, even with larger telescopes.