I enabe extender function manualy now. Ssid "cam".
If i turn off router and i waiting more than 2 minute camera ssid will be "dcs-933l-last4chars of macaddress".
If i turn on router, cameras CONNECTING again to wifi but "dcs-933l-last4chars of macaddress" ssid remains same, ssid "cam" will not be again.
Extender fuction will be unusable.
Sorry my Englis, I hope I wrote it well.