The OptoSigma range of manual stages and positioners are high quality and well-engineered. You will first notice that OptoSigma devices are heavier in comparison to many competing products. This indicates their robust and stable build, as the materials used are of a better quality. Rather than steel screws in an aluminium thread, OptoSigma use a steel screw in a brass thread. As the coefficient of friction is lower between the screw and thread, adjustments are more smooth and precise. The screws are not set into aluminium either – OptoSigma use brass, or in some cases sapphire, for robust and long-lasting stages.