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在体视观测的仪器上,要求两只目镜的焦距相等,使观测者的两眼可以同时看到清晰而倍率相同的象。否则,若相对焦距误差太大,仅仅依靠人眼的机能调节来改善观测质量,容易引起视觉疲劳。所以在这类仪器的图纸上,一般都标注了两只目镜相对倍率或相对焦距允差,即所谓目镜齐焦问题。焦距不仅是光学系统几何参数(r,d)和物理参数(n)的函数,而且是结构尺寸的
In the stereoscopic apparatus, the two eyepieces are required to have the same focal length so that both eyes of the observer can see clear and magnified images at the same time. Otherwise, if the relative focal error is too large, only rely on the human eye to adjust the function to improve the quality of observation, easily lead to visual fatigue. Therefore, in the drawings of such equipment, are generally marked two relative magnification or eyepiece relative magnification allowance, the so-called eyepiece quasi-coke problem. The focal length is not only a function of the optical system geometry (r, d) and the physical parameters (n), but also the size of the structure