why is it keeps zooming in zbrush?

[system]

why is it keeps zooming in zbrush? when i edit the clay, or sculpt on the clay it always zooms in everytime i edit the the clay? how to fix this? or something thanks

[beta_channel]

What?

[Doug_Jones]

? Recenter rate? http://docs.pixologic.com/reference-guide/preferences/interface/