How Far Can I Use Infrared Remote Control from the Camera?
The maximum operable distance between the camera and the RMT-DSLR1, RMT-DSLR2, and the RMT-VP1K infrared (IR) remote control, depending on the environment, is 25 feet (7.5 meters)
Note: Sunlight and fluorescent light can interfere with IR signals and reduce the usable distance of an IR remote control.