Sony A57 - Manual (Page 108)

108
Movie recording setup
MENU button t 1 t [Audio Recording] t [Off]
When the focus mode is set to manual focus, you can disable recording of
the operating noise of the lens for the autofocus (page 116).
To reduce wind noise
You can reduce wind noise by cutting bass sound input from the built-in
microphone.
MENU button t 1 t [Wind Noise Reduct.] t [On]
Notes
• Setting this item to [On] may cause some bass sound to be recorded with too low a
volume. Set it to [Off] when the wind is not blowing.
• When an external microphone (sold separately) is used, this item does not function.