Optical imaging has long been a key method of investigating scientific inquiry, enabling visualization and analysis of structures at various scales, from the microscopic to the macroscopic. The concept of spatial frequency is central to understanding and developing optical imaging techniques. This article explores the relationship between optical imaging and spatial frequency, delving into the fundamental principles, practical implications, and advancements in imaging technology that hinge on this relationship. This paper elucidates the critical influence of spatial frequency on the capabilities and limitations of optical imaging systems.