lens barrel

Place the eyepiece at the upper end of the lens barrel, and connect the nosepiece at the lower end. Divided into fixed and adjustable two. The length of the mechanical tube (the distance from the upper edge of the eyepiece tube to the lower end of the screw mouth of the nosepiece is called the length of the tube or the length of the mechanical tube) can not be changed is called a fixed tube, and the one that can be changed is called an adjustable tube. Most new microscopes use Fixed lens barrels, domestic microscopes also mostly use fixed lens barrels, and the mechanical barrel length of domestic microscopes is usually 160mm. There are two types of lens barrels for installing eyepieces: monocular and binocular. The single cylinder can be divided into two types: upright type and inclined type, and double cylinders are both inclined type.