Switching between two DIVE cameras.

Hello There

I have to shift between one DIVE camera two another DIVE camers in unity.Following is the requirement.
suppose there are total 100 frames.I want 1st DIVE camera setup should show till 50th frame and when we goes into 51the frame automaticallly 1st DIVE camera should get deactivate and 2nd DIVE camera should get activated on the screen.
I have tried animating the Disable function and Activate function but not working.

NOTE:- I have zero knowledge of script :(

Update:-i have found the solution.we just have to animate the Disable,Very simple.