| 摘要 |
An optical device has zoom lens system comprised of plurality of lens units which achieves zooming by varying unit-to-unit distances and an image sensor that converts optical image formed by zoom lens system into an electrical signal. The zoom lens system is comprised of, from the object side, at least first lens unit having a negative optical power and second lens unit having a positive optical power. Following conditional formulae are fulfilled: 2<|f1/fw|<4, and 0.058<(tan omegaw)2xfw/TLw<0.9, where f1 represents focal length of first lens unit, fw represents focal length of entire optical system at wide-angle end, tan omegaw represents half view angle at wide-angle end, and TLw represents total length (the distance from first vertex to image plane) at wide-angle end.
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