1Designating an optical instrument having a wide field of view; especially (a) a microscope in which the whole of the sample is illuminated (often as contrasted with a microscope in which an image is obtained by scanning); (b) an astronomical camera capable of producing detailed images covering a wide field of view, typically being sensitive enough to produce images of even faint celestial objects.
2Involving or utilizing optical instruments that have a wide field of view; (of an image, series of images, etc.) encompassing a wide field of view.
3Designating a lens having a short focal length and hence a wide field of view.
1920s; earliest use found in Science. From wide + field.