Canon ZR70 MC Instruction Manual page 72

❍ Low sound may be reduced together with the wind noise. We recommend
turning off the wind screen for normal recordings.
❍ The wind screen function cannot be turned on/off during recording.
❍ The wind screen function can also be used for audio dubbing (when [AUDIO
E
DUB.] is set to [MIC. IN] in the [AUDIO SET UP] submenu).
❍ The wind screen function cannot be used when an external microphone is
connected to the MIC terminal (ZR70 MC: or when the DM-50 Microphone is
attached to the advanced accessory shoe).