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The 4-position Axio Examiner objective turret is more complicated to use than the nosepieces of most other microscopes. It's a manual turret , so there's no software or touchpad control. However, but it doesn't simply freely rotate. Instead there is a dial knob on the front on the turret that must be rotated to the 'up' position to allow (white mark points upwards). This allows the user to rotate the objectives using the metallic ring above the dial knob (see gloved fingers in the image below). Rotating the dial knob to the 'down' position (white mark points downwards) lowers the selected objective lens for imaging. When the microscope is switched off the dial turret knob should be left parked with the 10x lens in the half way positionhalfway position (white mark points to the side). This ensures that the objective lens is far enough away from the stage to avoid damage, and that the turret cannot be unintentionally rotated.
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