Objektiivlääts

An objektiivlääts, or objective lens, is the lens or combination of lenses closest to the object being viewed in an optical instrument, such as a microscope or telescope. Its primary function is to gather light from the object and form an initial, real image. This image is then magnified further by subsequent lenses, typically the eyepiece. The quality of the objective lens is crucial for the overall performance of the instrument, as it directly impacts factors like resolution, magnification, and clarity. Objective lenses are characterized by their magnification power and numerical aperture (NA). Higher magnification allows for viewing finer details, while a higher NA indicates a greater ability to collect light and resolve small structures. Different types of objective lenses exist, including achromatic, plan achromatic, and apochromatic, each offering varying degrees of aberration correction. The design and manufacturing precision of an objektiivlääts are critical to minimizing optical distortions such as chromatic aberration and spherical aberration, ensuring an accurate and sharp representation of the specimen.