| 摘要 |
A lens tube of a microscope comprises a plurality of observation ports, and first and second optical path switching means to be moved relatively to each other for switching an optical path to an arbitrary one of the observation ports upon the relative movement. The first optical path switching means is capable of switching for guiding light from a specimen to the second optical path switching means trough a first optical element owned by the first optical path switching means upon the relative movement or for guiding the light to the second optical path switching means without passing through the first optical element. The second optical path switching means is capable of switching for guiding the light from the first optical path switching means to an arbitrary one of the observation ports through a second optical element owned by the second optical path switching means upon the relative movement, or for guiding the light to an arbitrary one of the observation ports without passing through the second optical element.
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