If you want to zoom, rotate the lens, near the object being extended. Come on, without having to move the camera, slide the beam again and rotate buttons phaplaiat to see the picture clearly.
To enlarge the image to make it larger. Rotate the objective lens with high magnification. Barreled into the line Without moving slide Then turn the knob to adjust the picture resolution to make things clearer.
If want to enlarge the bigger. To rotate the objective lens with its rise in the gun barrel, without moving the slide. And then spin the fine adjustment knob to see more clearly.