ILCE-1M2
You can expand the high end of the flash sync speed to 1/400 second when shooting with the full-frame view angle, and to 1/500 second when shooting with the APS-C view angle.
Since the aperture value can be made smaller by expanding the high end of the flash sync speed, you can use a flash to shoot images in a blurry background. Furthermore, you can capture a moving subject using a fast shutter speed with the flash while reducing camera shake.
If you set the shutter speed to 1/400 second (1/500 second when using the APS-C size dedicated lens) after a flash is attached to the camera, the (flash) icon will be displayed with the shutter speed setting value as shown below.
1/400
When the high end of the flash sync speed range is expanded and if you perform continuous shooting in the (Continuous Shooting: Hi+) mode or (Continuous Shooting: Hi) mode by setting the shutter speed to 1/400 second (1/500 second when shooting in the APS-C view angle), the maximum speed of continuous shooting may decrease.