CVar cameraDistanceMoveSpeed

Sets the speed that the camera zooms in and out.

Default Setting

 * 8.33

Possible Settings
This CVar accepts a range of settings from 0 - 50

Changing this setting
In-game, type the following /console cameraDistanceMoveSpeed setting

Alternatively, you can exit wow, open the Config-cache.wtf file, and add the following line: SET cameraDistanceMoveSpeed "setting"