AFOCAL GALILEAN ATTACHMENT LENS WITH HIGH PUPIL MAGNIFICATION

摘要

An afocal Galilean attachment lens (10) is disclosed, with the lens comprising, along an optical axis (Al), a first lens group (108) with overall negative optical power and a second lens group (109) 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, as defined by an aperture stop (110, with respective diameters DEX and DEN that define a pupil magnification PM = DEX/DEN > 4 and in some embodiments PM > 10. The afocal Galilean attachment lens also has a length parameter defined LP > 200 and in some embodiments LP > 700. 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.