Afocal Galilean attachment lens with high pupil magnification

摘要

An afocal Galilean attachment lens is disclosed, with the lens comprising, along an optical axis, a first lens group with overall negative optical power and a second lens group with overall positive power. The first and second lens groups are arranged to define a Galilean configuration. The lens also has exit and an entrance pupils with respective diameters D_EX and D_EN that define a pupil magnification PM=D_EX/D_EN4 and in some embodiments PM10. The afocal Galilean attachment lens also has a length parameter defined LP200 and in some embodiments LP700. The extreme length of the afocal Galilean attachment allows for photographing or filming objects that are remote or otherwise hard to photograph while also providing a relatively large depth of field.