Optical systems for endoscopes

Claim 1

Endoscope optics for microscopic survey observation and for microscopic detail observation wherein survey observation is accomplished with the object spaced from a distal lens means of the endoscope optics and detail observation is accomplished with an object substantially in contact with the distal lens means, the optics including distal lens means, relay lens means, displaceable lens means and proximal eyepiece lens comprising said displaceable lens means being situated between a last relay lens of the relay lens means and the eyepiece lens means and wherein the displaceable lens means is positionable selectively in a first magnification range (I) and, after transversing an undefined range (III) at a second magnification range (II) and wherein the magnification in the first magnification range differs from the magnification in the second magnification range and wherein focussing for both the survey observation and the detail observation can be adjusted in each of range (I) and range (II) and wherein survey observation of an object spaced from the distal lens means may be made in focus in range (I) at a first magnification and in focus at range (II) at a second magnification and wherein detail observation of objects substantially in contact with the distal lens means may be made in focus in range (I) at a first magnification and in focus in range (II) at a second magnification and wherein survey observation is at lesser magnification than detail observation.