Double Video Rec. Button
Main Parts
7
1. Main Parts and Displays
Video Rec/Stop can be operated with either button.
Video Rec. Button on the Top
When Handheld Shooting, Using a Tripod, etc.
Sub Video Rec. Button on the Front
When Using a Shoulder Rig, etc.
Start and stop video recording using the shutter button can be enabled 
or disabled*.  * Firmware must be updated to version 2.0 or later.
[       ] > [       ] >  2 > [ Assign REC to Shutter Button ] > [ ON ]