An objective is the primary lens positioned closest to the subject or specimen in optical instruments such as microscopes and telescopes. Its main function is to gather light and form an image, which is then magnified or viewed through additional optical elements.
In photography and scientific imaging, the quality and characteristics of the objective lens play a crucial role in determining image clarity, resolution, and magnification. High-quality objectives are essential for capturing fine detail, particularly in close-up, macro, and microscopic photography applications.