An optical system pair for a stereo endoscope is described which enables adjustment
of magnification matching in the production phase with low cost and small size
for the resulting stereo endoscope products. The stereo optical systempair for
stereo endoscope system includes a right optical system and a left optical system,
wherein one of the right and left optical systems includes a lens group which has
a refractive power, and which is designed to be moveable axially with a moveable
range and has a position within the moveable range at which optical magnification
equals to -1. Also described are optical arrangements of a stereo endoscope incorporating
the stereo optical system pair.
