Hiding objects from camera view

IS there a way to hide objects in unity from the camera view but when the object is in camera view then it appears?

I am not sure what is the term though.

whew man that is a CONFUSING question but yes if you dont have pro version then you cant use occlusion culling… which is what i think your talking about. However you can create a script that could check whether you are looking at the object and then determine whether you want it visible or invisible… i dont know if thats what you want but you can give it a try. Sorry but its a bit of a confusing question.