We've recently purchased an outboard Zoom/Focus/Iris controller the mobile cameras while mounted the monopod. This will help zooming and adjusting iris while maneuver the camera while attached to the monopod (especially during baptisms). See the illustration below for an overview of controls.
A couple important things to note.
1. Connect Cables: Once the camera is mounted to the monopod, connect the cables into "remote camera" section on the camera (illustrated below).
2. Adjust automatic switches: This unit will override the automatic iris and focus settings on the camera itself. Once the varizoom controller is plugged in set the automatic switches accordingly.
FOCUS SET TO AUTOMATIC
IRIS SET TO MANUAL