Patent ID: 7630148

Claim:
An optical system for a remote video inspection device including an elongated probe for inspection of target objects, comprising: an imager located distally within said probe, wherein said imager receives an image of said target object; a focus lens group located within said probe, said focus lens group comprising a variable aperture and at least one focus lens; a zoom lens group located within said probe, said zoom lens group comprising at least one zoom lens, wherein the movement of said zoom lens group in relation to said imager changes the magnification of said image; a tip lens located further from said imager than said focus lens group and said zoom lens group, wherein the distance between said tip lens and said imager is fixed; wherein said movement of said zoom lens group causes a first movement of said focus lens group proportional to said movement of said zoom lens group providing an initial image focus, and a second movement of said focus lens group independent of said movement of said zoom lens provides a final image focus and proportional changes to the size of said variable aperture.