Patent ID: 7236698

Claim:
An imaging system comprising an image pickup device, an image display device for displaying an image thereon, a controller for converting image information obtained from the image pickup device into signals capable of being displayed on the image display device, and a viewing optical system for guiding an image appearing on the image display device to a viewer's eye, wherein: the viewing optical system comprises, in order from an image display device side, one negative lens element and one positive lens element, and satisfies conditions (1) and (2): 0.45 <b/a (1) 2.3 <dp/dn <7 (2) where a is a distance from a display screen of the image display device to a surface of the viewing optical system, which is located nearest to the image display device side, b is an axial length from the surface of the viewing optical system which is located nearest to the image display device side to a surface of the viewing optical system which is located nearest to a viewer side, dp is a thickness of the positive lens element, and dn is a thickness of the negative lens element.