1. Slide transmission mechanism: This mechanism is simple in structure and compact in size. The slide matches the inner wall of the main lens tube with high-precision zoom. It can be designed into a multi-finger configuration for flexibility and can meet the design of multiple evenly distributed cam curve grooves. At the same time, both the slide and the main lens tube are made of industrial-grade hard aluminum, with the same temperature expansion coefficient, so that can meet the environmental conditions of large temperature changes.

2. Guide rod transmission mechanism: This mechanism uses two cylindrical guide rods as sliding guide rail components with high precision. However, it is an over-positioning mechanism, which, combined with a large aperture, can get stuck.

3. Rotary disk switching mechanism: This mechanism mounts multiple zoom lens groups onto a rotating disk, allowing for different focal length changes by rotating switch different zoom lenses to achieve the purpose of zoom. This is only suitable for zoom lenses without compensation groups and continuous zoom cannot be achieved.

Most of Quanhom's continuous zoom lenses use the first slide transmission mechanism. That is, when the motor drives the cam to rotate, the cam transmits the motion to the zoom slide and the compensation slide through the guide pins. The zoom slide and the compensation slide, under the guidance of straight grooves on the main lens tube, convert the rotation of the cam into parallel movement of the slide along the optical axis, so as to realize the zoom.