01

Take out the focusing lens from the lens frame: loosen the fastening screws and take down the air nozzle and the lens barrel in turn; First, use the blowing balloon to blow away the dust on the lens surface;

02

If the lens really needs to be cleaned, only a laboratory grade paper soft cotton ball can be used, dipped with an appropriate amount of acetone or high retention alcohol, and gently rotated clockwise from the center of the lens to the edge. Both sides of the lens need to be cleaned when necessary, and they should be carefully scrubbed;

03

Install the lens barrel and air nozzle, adjust the focus, tighten the fastening screws, and ensure that the convex face is downward when installing the focusing lens.