| 摘要 |
In a binocular optical sizing instrument, an adjustable image-splitting device is arranged, between an objective and the binocular viewing head, for use in measuring the diameters of viewed objects by the image-splitting method. The objective is arranged to form a primary real image of the field of view upstream of the common focal plane of the eyepieces of the binocular viewing head, and optical imaging means are positioned downstream of the primary real image to focus the field of view onto the said common focal plane. The optical system of the instrument is also arranged to form a real image of the objective's exit pupil at a point optically equivalent to the apparent image-splitting point of the device.
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