1. Technical parameters and requirements:
1.1 The focal length of the objective lens: F'=300mm
1.2 Objective lens magnification: 0.4X-2.75X continuous zoom
1.3 Total magnification: 2.7 times to 16.6 times
1.4 Zoom ratio: 1:6.8 stepless zoom
1.5 Field of view: 11mm-90mm
1.6 Focusing range: 20mm
1.7 Working distance: 250mm-300mm
1.8 Observation mirror tilt angle: 45°
1.9 *Eyepiece magnification: 10x
1.10 Zero-sight indication error: ±0.25
1.11 Minimum adjustment range of diopter: between +5 and -5
1.12 Interpupillary distance adjustment range: 55mm to 75mm
1.13 Noise: the noise of the microscope should not be greater than 60dB