The practical difference in an achromatic lens vs singlet lens comparison is wavelength control. A singlet uses one optical element and is usually adequate for monochromatic light, modest numerical aperture, or applications with relaxed imaging requirements. An achromatic lens normally combines two elements with different…

The practical difference in an F-theta lens vs standard focusing lens comparison is the job each optic is designed to perform. A standard focusing lens is normally chosen to form a good focus at one on-axis location, or within a limited field defined by its…