If cameraSpeed is = 1f all is perfect: smooth movement, stable.
If I put something like 10f, 20f, 50f the camera shakes. Even at the beginning of the test when the player is stopped (no movement taken) the camera shakes alot.
Time.deltaTime is the number of seconds that the previous time step (frame, physics step, etc.) took. Depending on how fast your computer is, this number can be high or low, and it will fluctuate between time steps.
where Clamp01(t) gives you 0 if t < 0, 1 if t > 1, and t if 0 < t < 1. You’re putting a fluctuating value in for your t value, which is the most likely cause for your shaking camera.