A lens device (3A) is connected to a lens device (3B) to be used in association therewith. The lens device includes a setting unit (25) setting the lens device (3A) as a master, and a control unit (22) driving a control object of the lens device (3A) in response to a control signal input to the lens device (3A) and transmitting the control signal for driving the control object of the lens device (3B) to the lens device (3B) with respect to the control object for which the master has been set by the setting unit. The control unit transmits a mode switching signal which instructs to switch to a slave operating mode that is operated in response to the control signal input from the lens device (3A), to the lens device (3B), with respect to the control object for which the master has been set.

A laser processing head, by means of which lenses in the beam path of the laser beam may be interchanged for the purposes of changing the beam diameter at the workpiece, wherein the laser processing head may have a structurally simple and compact embodiment.

Dual-pupil, dual spectral band wide field-of-view re-imaged refractive optical imaging systems. In one example an optical imaging system includes a dual-band front objective lens group configured to receive electromagnetic radiation over the field-of-view of the optical imaging system, to form a first pupil, and to direct the electromagnetic radiation through the first pupil, the electromagnetic radiation including first and second non-overlapping spectral bands, and the field-of-view spanning at least 4545, and a re-imaging refractive optical sub-system configured to receive the electromagnetic radiation via the first pupil, to form at least one intermediate image plane, and to focus the electromagnetic radiation via at least one second pupil onto at least one final image plane to form a first image from the first spectral band and a second image from the second spectral band. A beam deflector can be positioned proximate the first pupil to expand the field of view.

An embodiment of the present invention relates to an optical apparatus comprising: a first main body including first cover glass; a second main body including second cover glass and foldably connected to the first main body; a first optical module arranged in the first main body; and a second optical module which is arranged in the second main body and which overlaps with the first optical module in the optical axis direction when the first cover glass and the second cover glass are facing each other.

An image capturing optical system includes an image capturing optical lens assembly and at least two opening holes, respectively corresponding to a first mode and a second mode. The image capturing optical lens assembly includes, in order from an object side to an image side, an object-side lens group, a first light path folding element and a joint lens group. The object-side lens group is a first mode object-side lens group or a second mode object-side lens group, the joint lens group sequentially includes a middle lens group and a last lens group.

A zoom lens is provided which has at least one front optical group with fixed optical power, adapted to receive rays from an observed object, at least one rear optical group with fixed optical power, adapted to convey the rays towards an image plane of a sensor, a lens opening positioned between the front optical group and the rear optical group, a front adaptive lens positioned between the at least one front optical group and the lens opening, and a rear adaptive lens positioned behind the lens opening. The front and rear adaptive lenses are controllable to vary the respective optical power to adjust focal length, magnification, and working distance of the zoom lens.