Minimum object distance. This is a feature of a fixed or a zoom lens which indicates the closest distance an object can be from the lens’ image plane, expressed in meters. Zoom lenses have MOD of around 1 m, while fixed lenses usually much less, depending upon the focal length.
SPHERICAL VS. ASPHERIC LENSES
HOW THEY’RE USED IN IMAGING APPLICATIONS
Optical Lenses are often categorized by their shape. Two common surface shapes are spherical and aspherical. Each offers unique characteristics that make it suitable for different use cases.