Reflector or "Newtonian" type telescopes use a primary and secondary mirror to direct light to the telescope eyepiece and magnify the subject. As the correct alignment of these two mirrors is imperative for high performance regular maintenance is recommended.

All reflectors regardless of their origin are susceptible to knocks and bumps over time that can cause these mirrors to move out of alignment. The Sky-Watcher Collimation Eyepiece is ideal for precise collimation of Newtonians and refractors with an adjustable lenscells. This special eyepiece fits into 1.¼" focusers or diagonals. Alignment is easy using the small opening on one end and thin crosshairs at the other end.