I am hobby user of optical instruments. Binoculars, telescopes, rifle and spotting scopes and now microscopes. The Leica is my newest and most expensive microscope. Well used but all items appear to function as designed. Optical qualities, focus and resolution are very good and at higher powers one can focus on different levels of a cell structure. So, overall well satisfied with the microscope and its optical performance and the precision of the focusing adjustments. It appears well made and designed to be used in an industrial environment.