Sony ILCE-7S - Manual (Page 70)

The corners of a recorded image may be shaded, depending on the lens.
[51] How to Use Using shooting functions Using the flash
Flash Mode
You can set the flash mode.
1. MENU
→
(Camera Settings)
→ [Flash Mode] → desired setting.
Menu item details
Flash Off:
The flash does not operate.
Autoflash:
The flash works in dark environments or when shooting towards bright light.
Fill-flash (default setting):
The flash works every time you trigger the shutter.
Slow Sync.:
The flash works every time you trigger the shutter. Slow sync shooting allows you to shoot a
clear image of both the subject and the background by slowing the shutter speed.
Rear Sync.:
The flash works right before the exposure is completed every time you trigger the shutter.
Rear sync shooting allows you to shoot a natural image of the trail of a moving subject such
as a moving car or a walking person.
Wireless:
When using a wireless flash, the shading effect provides a more 3D appearance to a subject
than when using an attached flash.
This mode is effective when you attach a remote control-compatible external flash (sold
separately) to the product, and shoot with a wireless flash (sold separately), placed away
from the product.
Note
The default setting depends on the shooting mode.
Available flash mode depends on the shooting mode.