PROBLEM TO BE SOLVED: To facilitate focusing without losing a visual field upon movement of the visual field and even if the depth of field is deep.SOLUTION: The medical imaging apparatus includes a stereographic imaging optical system for stereoscopically imaging an operation part Q, aperture stops 13L and 13R for changing the field depth of the stereographic imaging optical system, a focusing motor 9a for focusing on the operation part Q, focusing state detecting means for detecting the variation of the focusing state in the stereographic imaging optical system, and a field depth control circuit 19 for controlling the aperture stops 13L and 13R of the stereographic imaging optical system based on information from the focusing state detecting means.COPYRIGHT: (C)2011,JPO&INPIT【課題】 視野移動時に視野を見失わず、また、被写界深度が深い場合であってもピントあわせを簡単に行うことを可能とすること。【解決手段】 術部Qを立体撮影するための立体撮影光学系と、立体撮影光学系の被写界深度を変更可能な開口絞り13L、13Rと、術部Qにピントを合わせるための焦準モータ9aと、前記立体撮影光学系における焦準状態の変化を検出する焦準状態検出手段と、前記焦準状態検出手段からの情報に基づき、前記立体撮影光学系の開口絞り13L、13Rを制御する被写界深度制御回路19とを備えた。【選択図】図3
