Abstract: The current invention describes a compact objective lens with enhanced distortion for near-infrared imaging, comprising a positively powered, aspheric, and meniscus first lens element; a negatively powered, aspheric, and meniscus second lens element; a positively powered, aspheric, and biconvex third lens element; a negatively powered, aspheric, and meniscus fourth lens element; a negatively powered, aspheric, and meniscus field corrector element; and a detector assembly comprising a window and a detector plane where the light rays come to focus.

Abstract: The current invention describes a compact objective lens with enhanced distortion for near-infrared imaging, comprising a positively powered, aspheric, and meniscus first lens element; a negatively powered, aspheric, and meniscus second lens element; a positively powered, aspheric, and biconvex third lens element; a negatively powered, aspheric, and meniscus fourth lens element; a negatively powered, aspheric, and meniscus field corrector element; and a detector assembly comprising a window and a detector plane where the light rays come to focus.

Abstract: A multiple field of view dual band optical device with integrated calibration source is disclosed. Such an optical device is modular, and has a rotating electro-mechanical “tumbler” which houses two orthogonal Galilean afocal optical assemblies as well as at least one uniform temperature source. This modular device is intended to be inserted in front of a camera system which already has an imager optical assembly mated to a detector focal plane array. The disclosed modular device thus serves the purpose of providing to an existing dual-band camera imager up to four new optical fields of view as well as an integral calibration source, all of which can be electro-mechanically selected for viewing by a host camera imager.

Abstract: A multiple field of view dual band optical device with integrated calibration source is disclosed. Such an optical device is modular, and has a rotating electro-mechanical “tumbler” which houses two orthogonal Galilean afocal optical assemblies as well as at least one uniform temperature source. This modular device is intended to be inserted in front of a camera system which already has an imager optical assembly mated to a detector focal plane array. The disclosed modular device thus serves the purpose of providing to an existing dual-band camera imager up to four new optical fields of view as well as an integral calibration source, all of which can be electro-mechanically selected for viewing by a host camera imager.