A collimator is an instrument that projects the image of a reticle to a certain distance, usually to infinity. If the collimator reticle is located in the focal plane of the objective, a bundle of parallel light emerges from the collimator. In this case no real image of the reticle arises.
MÖLLER-WEDEL OPTICAL offers collimators with fixed focus settings as well as collimators with adjustable focus settings.
Collimators with fixed focus setting
Collimators with adjustable focus setting
Measuring tasks requiring different wavelengths of light, or measurements requiring variable focus (finite and/or infinite) are best accomplished using focusable collimators. With the aid of the tube extension the position of the reticle in respect to the focal plane of the objective is changeable. As a result of that the former parallel beam converts into a convergent or divergent beam and yields a real or virtual image of the reticle.