视场光阑是安装在目镜镜筒内的金属的圆环用来限定范围的大小。
The field stop is the metal ring inside the eyepiece barrel that limits the field size.
针对物镜筒注塑件，设计了一种内收式二瓣牙内螺纹模具结构。
Designed a injection mold with two teeth threaded core-pulling mechanism for the objective slide.
该二个致动器分别固定设置于所述镜筒内。
The two actuators are fixedly arranged in the lens barrel respectively.
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